diff --git a/Asterism.xcodeproj/project.pbxproj b/Asterism.xcodeproj/project.pbxproj
index 7dbac42..31dfd2d 100644
--- a/Asterism.xcodeproj/project.pbxproj
+++ b/Asterism.xcodeproj/project.pbxproj
@@ -27,6 +27,10 @@
 		54892BAE184AAFFE009CF268 /* ASTAllSpec.m in Sources */ = {isa = PBXBuildFile; fileRef = 54892BAD184AAFFE009CF268 /* ASTAllSpec.m */; };
 		54892BB1184AB0F6009CF268 /* ASTAny.m in Sources */ = {isa = PBXBuildFile; fileRef = 54892BB0184AB0F6009CF268 /* ASTAny.m */; };
 		54892BB3184AB268009CF268 /* ASTAnySpec.m in Sources */ = {isa = PBXBuildFile; fileRef = 54892BB2184AB268009CF268 /* ASTAnySpec.m */; };
+		549965DB192E1BB200242F07 /* metamacros.h in Headers */ = {isa = PBXBuildFile; fileRef = 549965DA192E1BB200242F07 /* metamacros.h */; };
+		549965DD192E1E6600242F07 /* ASTChainSpec.m in Sources */ = {isa = PBXBuildFile; fileRef = 549965DC192E1E6600242F07 /* ASTChainSpec.m */; };
+		549965DE192E1E6C00242F07 /* ASTChainSpec.m in Sources */ = {isa = PBXBuildFile; fileRef = 549965DC192E1E6600242F07 /* ASTChainSpec.m */; };
+		549965DF192E35AB00242F07 /* ASTChain.h in Headers */ = {isa = PBXBuildFile; fileRef = 549965D7192E1B7700242F07 /* ASTChain.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		549B7264175CFE6700E6A378 /* ASTReject.m in Sources */ = {isa = PBXBuildFile; fileRef = 549B7263175CFE6700E6A378 /* ASTReject.m */; };
 		549B7268175D07CF00E6A378 /* ASTNegate.m in Sources */ = {isa = PBXBuildFile; fileRef = 549B7267175D07CF00E6A378 /* ASTNegate.m */; };
 		549B726A175D08E400E6A378 /* ASTRejectSpec.m in Sources */ = {isa = PBXBuildFile; fileRef = 549B7269175D08E400E6A378 /* ASTRejectSpec.m */; };
@@ -222,6 +226,9 @@
 		54892BAF184AB0F6009CF268 /* ASTAny.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ASTAny.h; sourceTree = "<group>"; };
 		54892BB0184AB0F6009CF268 /* ASTAny.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ASTAny.m; sourceTree = "<group>"; };
 		54892BB2184AB268009CF268 /* ASTAnySpec.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ASTAnySpec.m; sourceTree = "<group>"; };
+		549965D7192E1B7700242F07 /* ASTChain.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ASTChain.h; sourceTree = "<group>"; };
+		549965DA192E1BB200242F07 /* metamacros.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = metamacros.h; sourceTree = "<group>"; };
+		549965DC192E1E6600242F07 /* ASTChainSpec.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = ASTChainSpec.m; sourceTree = "<group>"; };
 		549B7262175CFE6700E6A378 /* ASTReject.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ASTReject.h; sourceTree = "<group>"; };
 		549B7263175CFE6700E6A378 /* ASTReject.m */ = {isa = PBXFileReference; explicitFileType = sourcecode.c.objc; fileEncoding = 4; path = ASTReject.m; sourceTree = "<group>"; };
 		549B7266175D07CF00E6A378 /* ASTNegate.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ASTNegate.h; sourceTree = "<group>"; };
@@ -399,6 +406,7 @@
 				54892BAB184AAEFD009CF268 /* ASTAll.m */,
 				54892BAF184AB0F6009CF268 /* ASTAny.h */,
 				54892BB0184AB0F6009CF268 /* ASTAny.m */,
+				549965D7192E1B7700242F07 /* ASTChain.h */,
 				54DDBE251837EB05002EAEB3 /* ASTDefaults.h */,
 				54DDBE261837EB05002EAEB3 /* ASTDefaults.m */,
 				54FE96DC17704C7F006F40AC /* ASTDifference.h */,
@@ -451,6 +459,7 @@
 				54FE96E2177053FE006F40AC /* ASTUnion.m */,
 				545059C1186274E100A062D9 /* ASTWithout.h */,
 				545059C2186274E100A062D9 /* ASTWithout.m */,
+				549965DA192E1BB200242F07 /* metamacros.h */,
 				54D9EE6B1721543D00383762 /* Supporting Files */,
 			);
 			path = Asterism;
@@ -470,6 +479,7 @@
 			children = (
 				54892BAD184AAFFE009CF268 /* ASTAllSpec.m */,
 				54892BB2184AB268009CF268 /* ASTAnySpec.m */,
+				549965DC192E1E6600242F07 /* ASTChainSpec.m */,
 				5424E956183D80E800E4EC51 /* ASTDefaultsSpec.m */,
 				54FE96DF17704FF7006F40AC /* ASTDifferenceSpec.m */,
 				54E1B64917215783008A2175 /* ASTEachSpec.m */,
@@ -543,9 +553,11 @@
 				54E002FC18C921A500B66BC3 /* ASTIntersection.h in Headers */,
 				54E002FB18C921A500B66BC3 /* ASTIndexOf.h in Headers */,
 				54E002F618C921A500B66BC3 /* ASTFind.h in Headers */,
+				549965DF192E35AB00242F07 /* ASTChain.h in Headers */,
 				54E0030518C921A500B66BC3 /* ASTSize.h in Headers */,
 				54E0030318C921A500B66BC3 /* ASTReject.h in Headers */,
 				54E002F918C921A500B66BC3 /* ASTHead.h in Headers */,
+				549965DB192E1BB200242F07 /* metamacros.h in Headers */,
 				54E002EF18C921A500B66BC3 /* ASTAny.h in Headers */,
 				54E0030418C921A500B66BC3 /* ASTShuffle.h in Headers */,
 				54E002FF18C921A500B66BC3 /* ASTNegate.h in Headers */,
@@ -830,6 +842,7 @@
 				5484EEAD1854C6AF000B4D04 /* ASTSizeSpec.m in Sources */,
 				5424E957183D80E800E4EC51 /* ASTDefaultsSpec.m in Sources */,
 				549B726C175D097100E6A378 /* ASTNegateSpec.m in Sources */,
+				549965DD192E1E6600242F07 /* ASTChainSpec.m in Sources */,
 				54A72CC1175D0FD500D9A05E /* ASTPluckSpec.m in Sources */,
 				549DFB8E175E5526005CAD4A /* ASTGroupBySpec.m in Sources */,
 				54A0BB2E175E647E001D06E2 /* ASTMinMaxSpec.m in Sources */,
@@ -900,6 +913,7 @@
 				54E0032218C925F700B66BC3 /* ASTShuffleSpec.m in Sources */,
 				54E0031A18C925F700B66BC3 /* ASTMapSpec.m in Sources */,
 				54E0031218C925F700B66BC3 /* ASTFilterSpec.m in Sources */,
+				549965DE192E1E6C00242F07 /* ASTChainSpec.m in Sources */,
 				54E0031F18C925F700B66BC3 /* ASTReduceSpec.m in Sources */,
 				54E0032018C925F700B66BC3 /* ASTRejectSpec.m in Sources */,
 				54E0030D18C925F700B66BC3 /* ASTDefaultsSpec.m in Sources */,
diff --git a/Asterism/ASTChain.h b/Asterism/ASTChain.h
new file mode 100644
index 0000000..c755e85
--- /dev/null
+++ b/Asterism/ASTChain.h
@@ -0,0 +1,40 @@
+//
+//  ASTChain.h
+//  Asterism
+//
+//  Created by Robert Böhnke on 22/05/14.
+//  Copyright (c) 2014 Robert Böhnke. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+#import "metamacros.h"
+
+#define ASTChain(...) \
+    ASTChain_(__VA_ARGS__)
+
+// IMPLEMENTATION DETAILS FOLLOW!
+// Do not write code that depends on anything below this line.
+#define ASTChain_Block_Open ({
+#define ASTChain_Block_Close });
+
+#define ASTChain_Block_Close_Iter(INDEX, CONTEXT) });
+
+#define ASTFoo(INDEX, CONTEXT, ARG) \
+    metamacro_if_eq(INDEX, metamacro_dec(CONTEXT)) \
+        ( \
+            ASTChain_Block_Open \
+                ARG; \
+            ASTChain_Block_Close \
+            metamacro_for_cxt(metamacro_dec(CONTEXT), ASTChain_Block_Close_Iter, , ) \
+        ) \
+        ( \
+            ASTChain_Block_Open \
+                typeof ( ARG ) metamacro_concat(ASTChain_tmp_, INDEX) = ARG; \
+                typeof ( ARG ) _ = metamacro_concat(ASTChain_tmp_, INDEX); \
+        )
+
+#define ASTChain_(...) \
+    ({ \
+        metamacro_foreach_cxt(ASTFoo, , metamacro_argcount(__VA_ARGS__), __VA_ARGS__) \
+    })
diff --git a/Asterism/Asterism.h b/Asterism/Asterism.h
index 9567957..915a6dd 100644
--- a/Asterism/Asterism.h
+++ b/Asterism/Asterism.h
@@ -12,6 +12,7 @@
 
 #import "ASTAll.h"
 #import "ASTAny.h"
+#import "ASTChain.h"
 #import "ASTDefaults.h"
 #import "ASTDifference.h"
 #import "ASTEach.h"
diff --git a/Asterism/metamacros.h b/Asterism/metamacros.h
new file mode 100644
index 0000000..dc74100
--- /dev/null
+++ b/Asterism/metamacros.h
@@ -0,0 +1,670 @@
+/**
+ * Macros for metaprogramming
+ * ExtendedC
+ *
+ * Copyright (C) 2012 Justin Spahr-Summers
+ * Released under the MIT license
+ */
+
+#ifndef EXTC_METAMACROS_H
+#define EXTC_METAMACROS_H
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+/**
+ * Executes one or more expressions (which may have a void type, such as a call
+ * to a function that returns no value) and always returns true.
+ */
+#define metamacro_exprify(...) \
+    ((__VA_ARGS__), true)
+
+/**
+ * Returns a string representation of VALUE after full macro expansion.
+ */
+#define metamacro_stringify(VALUE) \
+        metamacro_stringify_(VALUE)
+
+/**
+ * Returns A and B concatenated after full macro expansion.
+ */
+#define metamacro_concat(A, B) \
+        metamacro_concat_(A, B)
+
+/**
+ * Returns the Nth variadic argument (starting from zero). At least
+ * N + 1 variadic arguments must be given. N must be between zero and twenty,
+ * inclusive.
+ */
+#define metamacro_at(N, ...) \
+        metamacro_concat(metamacro_at, N)(__VA_ARGS__)
+
+/**
+ * Returns the number of arguments (up to twenty) provided to the macro. At
+ * least one argument must be provided.
+ *
+ * Inspired by P99: http://p99.gforge.inria.fr
+ */
+#define metamacro_argcount(...) \
+        metamacro_at(20, __VA_ARGS__, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
+
+/**
+ * Identical to #metamacro_foreach_cxt, except that no CONTEXT argument is
+ * given. Only the index and current argument will thus be passed to MACRO.
+ */
+#define metamacro_foreach(MACRO, SEP, ...) \
+        metamacro_foreach_cxt(metamacro_foreach_iter, SEP, MACRO, __VA_ARGS__)
+
+/**
+ * For each consecutive variadic argument (up to twenty), MACRO is passed the
+ * zero-based index of the current argument, CONTEXT, and then the argument
+ * itself. The results of adjoining invocations of MACRO are then separated by
+ * SEP.
+ *
+ * Inspired by P99: http://p99.gforge.inria.fr
+ */
+#define metamacro_foreach_cxt(MACRO, SEP, CONTEXT, ...) \
+        metamacro_concat(metamacro_foreach_cxt, metamacro_argcount(__VA_ARGS__))(MACRO, SEP, CONTEXT, __VA_ARGS__)
+
+/**
+ * Identical to #metamacro_foreach_cxt. This can be used when the former would
+ * fail due to recursive macro expansion.
+ */
+#define metamacro_foreach_cxt_recursive(MACRO, SEP, CONTEXT, ...) \
+        metamacro_concat(metamacro_foreach_cxt_recursive, metamacro_argcount(__VA_ARGS__))(MACRO, SEP, CONTEXT, __VA_ARGS__)
+
+/**
+ * In consecutive order, appends each variadic argument (up to twenty) onto
+ * BASE. The resulting concatenations are then separated by SEP.
+ *
+ * This is primarily useful to manipulate a list of macro invocations into instead
+ * invoking a different, possibly related macro.
+ */
+#define metamacro_foreach_concat(BASE, SEP, ...) \
+        metamacro_foreach_cxt(metamacro_foreach_concat_iter, SEP, BASE, __VA_ARGS__)
+
+/**
+ * Iterates COUNT times, each time invoking MACRO with the current index
+ * (starting at zero) and CONTEXT. The results of adjoining invocations of MACRO
+ * are then separated by SEP.
+ *
+ * COUNT must be an integer between zero and twenty, inclusive.
+ */
+#define metamacro_for_cxt(COUNT, MACRO, SEP, CONTEXT) \
+        metamacro_concat(metamacro_for_cxt, COUNT)(MACRO, SEP, CONTEXT)
+
+/**
+ * Returns the first argument given. At least one argument must be provided.
+ *
+ * This is useful when implementing a variadic macro, where you may have only
+ * one variadic argument, but no way to retrieve it (for example, because \c ...
+ * always needs to match at least one argument).
+ *
+ * @code
+
+#define varmacro(...) \
+    metamacro_head(__VA_ARGS__)
+
+ * @endcode
+ */
+#define metamacro_head(...) \
+        metamacro_head_(__VA_ARGS__, 0)
+
+/**
+ * Returns every argument except the first. At least two arguments must be
+ * provided.
+ */
+#define metamacro_tail(...) \
+        metamacro_tail_(__VA_ARGS__)
+
+/**
+ * Returns the first N (up to twenty) variadic arguments as a new argument list.
+ * At least N variadic arguments must be provided.
+ */
+#define metamacro_take(N, ...) \
+        metamacro_concat(metamacro_take, N)(__VA_ARGS__)
+
+/**
+ * Removes the first N (up to twenty) variadic arguments from the given argument
+ * list. At least N variadic arguments must be provided.
+ */
+#define metamacro_drop(N, ...) \
+        metamacro_concat(metamacro_drop, N)(__VA_ARGS__)
+
+/**
+ * Decrements VAL, which must be a number between zero and twenty, inclusive.
+ *
+ * This is primarily useful when dealing with indexes and counts in
+ * metaprogramming.
+ */
+#define metamacro_dec(VAL) \
+        metamacro_at(VAL, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
+
+/**
+ * Increments VAL, which must be a number between zero and twenty, inclusive.
+ *
+ * This is primarily useful when dealing with indexes and counts in
+ * metaprogramming.
+ */
+#define metamacro_inc(VAL) \
+        metamacro_at(VAL, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
+
+/**
+ * If A is equal to B, the next argument list is expanded; otherwise, the
+ * argument list after that is expanded. A and B must be numbers between zero
+ * and twenty, inclusive. Additionally, B must be greater than or equal to A.
+ *
+ * @code
+
+// expands to true
+metamacro_if_eq(0, 0)(true)(false)
+
+// expands to false
+metamacro_if_eq(0, 1)(true)(false)
+
+ * @endcode
+ *
+ * This is primarily useful when dealing with indexes and counts in
+ * metaprogramming.
+ */
+#define metamacro_if_eq(A, B) \
+        metamacro_concat(metamacro_if_eq, A)(B)
+
+/**
+ * Identical to #metamacro_if_eq. This can be used when the former would fail
+ * due to recursive macro expansion.
+ */
+#define metamacro_if_eq_recursive(A, B) \
+        metamacro_concat(metamacro_if_eq_recursive, A)(B)
+
+/**
+ * Returns 1 if N is an even number, or 0 otherwise. N must be between zero and
+ * twenty, inclusive.
+ *
+ * For the purposes of this test, zero is considered even.
+ */
+#define metamacro_is_even(N) \
+        metamacro_at(N, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1)
+
+/**
+ * Returns the logical NOT of B, which must be the number zero or one.
+ */
+#define metamacro_not(B) \
+        metamacro_at(B, 1, 0)
+
+// IMPLEMENTATION DETAILS FOLLOW!
+// Do not write code that depends on anything below this line.
+#define metamacro_stringify_(VALUE) # VALUE
+#define metamacro_concat_(A, B) A ## B
+#define metamacro_foreach_iter(INDEX, MACRO, ARG) MACRO(INDEX, ARG)
+#define metamacro_head_(FIRST, ...) FIRST
+#define metamacro_tail_(FIRST, ...) __VA_ARGS__
+#define metamacro_consume_(...)
+#define metamacro_expand_(...) __VA_ARGS__
+
+// implemented from scratch so that metamacro_concat() doesn't end up nesting
+#define metamacro_foreach_concat_iter(INDEX, BASE, ARG) metamacro_foreach_concat_iter_(BASE, ARG)
+#define metamacro_foreach_concat_iter_(BASE, ARG) BASE ## ARG
+
+// metamacro_at expansions
+#define metamacro_at0(...) metamacro_head(__VA_ARGS__)
+#define metamacro_at1(_0, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at2(_0, _1, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at3(_0, _1, _2, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at4(_0, _1, _2, _3, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at5(_0, _1, _2, _3, _4, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at6(_0, _1, _2, _3, _4, _5, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at7(_0, _1, _2, _3, _4, _5, _6, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at8(_0, _1, _2, _3, _4, _5, _6, _7, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at9(_0, _1, _2, _3, _4, _5, _6, _7, _8, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at10(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at11(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at12(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at13(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at14(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at15(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at16(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at17(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at18(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at19(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, ...) metamacro_head(__VA_ARGS__)
+#define metamacro_at20(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, ...) metamacro_head(__VA_ARGS__)
+
+// metamacro_foreach_cxt expansions
+#define metamacro_foreach_cxt0(MACRO, SEP, CONTEXT)
+#define metamacro_foreach_cxt1(MACRO, SEP, CONTEXT, _0) MACRO(0, CONTEXT, _0)
+
+#define metamacro_foreach_cxt2(MACRO, SEP, CONTEXT, _0, _1) \
+    metamacro_foreach_cxt1(MACRO, SEP, CONTEXT, _0) \
+    SEP \
+    MACRO(1, CONTEXT, _1)
+
+#define metamacro_foreach_cxt3(MACRO, SEP, CONTEXT, _0, _1, _2) \
+    metamacro_foreach_cxt2(MACRO, SEP, CONTEXT, _0, _1) \
+    SEP \
+    MACRO(2, CONTEXT, _2)
+
+#define metamacro_foreach_cxt4(MACRO, SEP, CONTEXT, _0, _1, _2, _3) \
+    metamacro_foreach_cxt3(MACRO, SEP, CONTEXT, _0, _1, _2) \
+    SEP \
+    MACRO(3, CONTEXT, _3)
+
+#define metamacro_foreach_cxt5(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4) \
+    metamacro_foreach_cxt4(MACRO, SEP, CONTEXT, _0, _1, _2, _3) \
+    SEP \
+    MACRO(4, CONTEXT, _4)
+
+#define metamacro_foreach_cxt6(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5) \
+    metamacro_foreach_cxt5(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4) \
+    SEP \
+    MACRO(5, CONTEXT, _5)
+
+#define metamacro_foreach_cxt7(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6) \
+    metamacro_foreach_cxt6(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5) \
+    SEP \
+    MACRO(6, CONTEXT, _6)
+
+#define metamacro_foreach_cxt8(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7) \
+    metamacro_foreach_cxt7(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6) \
+    SEP \
+    MACRO(7, CONTEXT, _7)
+
+#define metamacro_foreach_cxt9(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8) \
+    metamacro_foreach_cxt8(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7) \
+    SEP \
+    MACRO(8, CONTEXT, _8)
+
+#define metamacro_foreach_cxt10(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9) \
+    metamacro_foreach_cxt9(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8) \
+    SEP \
+    MACRO(9, CONTEXT, _9)
+
+#define metamacro_foreach_cxt11(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \
+    metamacro_foreach_cxt10(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9) \
+    SEP \
+    MACRO(10, CONTEXT, _10)
+
+#define metamacro_foreach_cxt12(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \
+    metamacro_foreach_cxt11(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \
+    SEP \
+    MACRO(11, CONTEXT, _11)
+
+#define metamacro_foreach_cxt13(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \
+    metamacro_foreach_cxt12(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \
+    SEP \
+    MACRO(12, CONTEXT, _12)
+
+#define metamacro_foreach_cxt14(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \
+    metamacro_foreach_cxt13(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \
+    SEP \
+    MACRO(13, CONTEXT, _13)
+
+#define metamacro_foreach_cxt15(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \
+    metamacro_foreach_cxt14(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \
+    SEP \
+    MACRO(14, CONTEXT, _14)
+
+#define metamacro_foreach_cxt16(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15) \
+    metamacro_foreach_cxt15(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \
+    SEP \
+    MACRO(15, CONTEXT, _15)
+
+#define metamacro_foreach_cxt17(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16) \
+    metamacro_foreach_cxt16(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15) \
+    SEP \
+    MACRO(16, CONTEXT, _16)
+
+#define metamacro_foreach_cxt18(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17) \
+    metamacro_foreach_cxt17(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16) \
+    SEP \
+    MACRO(17, CONTEXT, _17)
+
+#define metamacro_foreach_cxt19(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18) \
+    metamacro_foreach_cxt18(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17) \
+    SEP \
+    MACRO(18, CONTEXT, _18)
+
+#define metamacro_foreach_cxt20(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19) \
+    metamacro_foreach_cxt19(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18) \
+    SEP \
+    MACRO(19, CONTEXT, _19)
+
+// metamacro_foreach_cxt_recursive expansions
+#define metamacro_foreach_cxt_recursive0(MACRO, SEP, CONTEXT)
+#define metamacro_foreach_cxt_recursive1(MACRO, SEP, CONTEXT, _0) MACRO(0, CONTEXT, _0)
+
+#define metamacro_foreach_cxt_recursive2(MACRO, SEP, CONTEXT, _0, _1) \
+    metamacro_foreach_cxt_recursive1(MACRO, SEP, CONTEXT, _0) \
+    SEP \
+    MACRO(1, CONTEXT, _1)
+
+#define metamacro_foreach_cxt_recursive3(MACRO, SEP, CONTEXT, _0, _1, _2) \
+    metamacro_foreach_cxt_recursive2(MACRO, SEP, CONTEXT, _0, _1) \
+    SEP \
+    MACRO(2, CONTEXT, _2)
+
+#define metamacro_foreach_cxt_recursive4(MACRO, SEP, CONTEXT, _0, _1, _2, _3) \
+    metamacro_foreach_cxt_recursive3(MACRO, SEP, CONTEXT, _0, _1, _2) \
+    SEP \
+    MACRO(3, CONTEXT, _3)
+
+#define metamacro_foreach_cxt_recursive5(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4) \
+    metamacro_foreach_cxt_recursive4(MACRO, SEP, CONTEXT, _0, _1, _2, _3) \
+    SEP \
+    MACRO(4, CONTEXT, _4)
+
+#define metamacro_foreach_cxt_recursive6(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5) \
+    metamacro_foreach_cxt_recursive5(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4) \
+    SEP \
+    MACRO(5, CONTEXT, _5)
+
+#define metamacro_foreach_cxt_recursive7(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6) \
+    metamacro_foreach_cxt_recursive6(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5) \
+    SEP \
+    MACRO(6, CONTEXT, _6)
+
+#define metamacro_foreach_cxt_recursive8(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7) \
+    metamacro_foreach_cxt_recursive7(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6) \
+    SEP \
+    MACRO(7, CONTEXT, _7)
+
+#define metamacro_foreach_cxt_recursive9(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8) \
+    metamacro_foreach_cxt_recursive8(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7) \
+    SEP \
+    MACRO(8, CONTEXT, _8)
+
+#define metamacro_foreach_cxt_recursive10(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9) \
+    metamacro_foreach_cxt_recursive9(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8) \
+    SEP \
+    MACRO(9, CONTEXT, _9)
+
+#define metamacro_foreach_cxt_recursive11(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \
+    metamacro_foreach_cxt_recursive10(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9) \
+    SEP \
+    MACRO(10, CONTEXT, _10)
+
+#define metamacro_foreach_cxt_recursive12(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \
+    metamacro_foreach_cxt_recursive11(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \
+    SEP \
+    MACRO(11, CONTEXT, _11)
+
+#define metamacro_foreach_cxt_recursive13(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \
+    metamacro_foreach_cxt_recursive12(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \
+    SEP \
+    MACRO(12, CONTEXT, _12)
+
+#define metamacro_foreach_cxt_recursive14(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \
+    metamacro_foreach_cxt_recursive13(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \
+    SEP \
+    MACRO(13, CONTEXT, _13)
+
+#define metamacro_foreach_cxt_recursive15(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \
+    metamacro_foreach_cxt_recursive14(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \
+    SEP \
+    MACRO(14, CONTEXT, _14)
+
+#define metamacro_foreach_cxt_recursive16(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15) \
+    metamacro_foreach_cxt_recursive15(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \
+    SEP \
+    MACRO(15, CONTEXT, _15)
+
+#define metamacro_foreach_cxt_recursive17(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16) \
+    metamacro_foreach_cxt_recursive16(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15) \
+    SEP \
+    MACRO(16, CONTEXT, _16)
+
+#define metamacro_foreach_cxt_recursive18(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17) \
+    metamacro_foreach_cxt_recursive17(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16) \
+    SEP \
+    MACRO(17, CONTEXT, _17)
+
+#define metamacro_foreach_cxt_recursive19(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18) \
+    metamacro_foreach_cxt_recursive18(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17) \
+    SEP \
+    MACRO(18, CONTEXT, _18)
+
+#define metamacro_foreach_cxt_recursive20(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19) \
+    metamacro_foreach_cxt_recursive19(MACRO, SEP, CONTEXT, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18) \
+    SEP \
+    MACRO(19, CONTEXT, _19)
+
+// metamacro_for_cxt expansions
+#define metamacro_for_cxt0(MACRO, SEP, CONTEXT)
+#define metamacro_for_cxt1(MACRO, SEP, CONTEXT) MACRO(0, CONTEXT)
+
+#define metamacro_for_cxt2(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt1(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(1, CONTEXT)
+
+#define metamacro_for_cxt3(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt2(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(2, CONTEXT)
+
+#define metamacro_for_cxt4(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt3(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(3, CONTEXT)
+
+#define metamacro_for_cxt5(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt4(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(4, CONTEXT)
+
+#define metamacro_for_cxt6(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt5(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(5, CONTEXT)
+
+#define metamacro_for_cxt7(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt6(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(6, CONTEXT)
+
+#define metamacro_for_cxt8(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt7(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(7, CONTEXT)
+
+#define metamacro_for_cxt9(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt8(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(8, CONTEXT)
+
+#define metamacro_for_cxt10(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt9(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(9, CONTEXT)
+
+#define metamacro_for_cxt11(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt10(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(10, CONTEXT)
+
+#define metamacro_for_cxt12(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt11(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(11, CONTEXT)
+
+#define metamacro_for_cxt13(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt12(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(12, CONTEXT)
+
+#define metamacro_for_cxt14(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt13(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(13, CONTEXT)
+
+#define metamacro_for_cxt15(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt14(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(14, CONTEXT)
+
+#define metamacro_for_cxt16(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt15(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(15, CONTEXT)
+
+#define metamacro_for_cxt17(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt16(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(16, CONTEXT)
+
+#define metamacro_for_cxt18(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt17(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(17, CONTEXT)
+
+#define metamacro_for_cxt19(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt18(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(18, CONTEXT)
+
+#define metamacro_for_cxt20(MACRO, SEP, CONTEXT) \
+    metamacro_for_cxt19(MACRO, SEP, CONTEXT) \
+    SEP \
+    MACRO(19, CONTEXT)
+
+// metamacro_if_eq expansions
+#define metamacro_if_eq0(VALUE) \
+    metamacro_concat(metamacro_if_eq0_, VALUE)
+
+#define metamacro_if_eq0_0(...) __VA_ARGS__ metamacro_consume_
+#define metamacro_if_eq0_1(...) metamacro_expand_
+#define metamacro_if_eq0_2(...) metamacro_expand_
+#define metamacro_if_eq0_3(...) metamacro_expand_
+#define metamacro_if_eq0_4(...) metamacro_expand_
+#define metamacro_if_eq0_5(...) metamacro_expand_
+#define metamacro_if_eq0_6(...) metamacro_expand_
+#define metamacro_if_eq0_7(...) metamacro_expand_
+#define metamacro_if_eq0_8(...) metamacro_expand_
+#define metamacro_if_eq0_9(...) metamacro_expand_
+#define metamacro_if_eq0_10(...) metamacro_expand_
+#define metamacro_if_eq0_11(...) metamacro_expand_
+#define metamacro_if_eq0_12(...) metamacro_expand_
+#define metamacro_if_eq0_13(...) metamacro_expand_
+#define metamacro_if_eq0_14(...) metamacro_expand_
+#define metamacro_if_eq0_15(...) metamacro_expand_
+#define metamacro_if_eq0_16(...) metamacro_expand_
+#define metamacro_if_eq0_17(...) metamacro_expand_
+#define metamacro_if_eq0_18(...) metamacro_expand_
+#define metamacro_if_eq0_19(...) metamacro_expand_
+#define metamacro_if_eq0_20(...) metamacro_expand_
+
+#define metamacro_if_eq1(VALUE) metamacro_if_eq0(metamacro_dec(VALUE))
+#define metamacro_if_eq2(VALUE) metamacro_if_eq1(metamacro_dec(VALUE))
+#define metamacro_if_eq3(VALUE) metamacro_if_eq2(metamacro_dec(VALUE))
+#define metamacro_if_eq4(VALUE) metamacro_if_eq3(metamacro_dec(VALUE))
+#define metamacro_if_eq5(VALUE) metamacro_if_eq4(metamacro_dec(VALUE))
+#define metamacro_if_eq6(VALUE) metamacro_if_eq5(metamacro_dec(VALUE))
+#define metamacro_if_eq7(VALUE) metamacro_if_eq6(metamacro_dec(VALUE))
+#define metamacro_if_eq8(VALUE) metamacro_if_eq7(metamacro_dec(VALUE))
+#define metamacro_if_eq9(VALUE) metamacro_if_eq8(metamacro_dec(VALUE))
+#define metamacro_if_eq10(VALUE) metamacro_if_eq9(metamacro_dec(VALUE))
+#define metamacro_if_eq11(VALUE) metamacro_if_eq10(metamacro_dec(VALUE))
+#define metamacro_if_eq12(VALUE) metamacro_if_eq11(metamacro_dec(VALUE))
+#define metamacro_if_eq13(VALUE) metamacro_if_eq12(metamacro_dec(VALUE))
+#define metamacro_if_eq14(VALUE) metamacro_if_eq13(metamacro_dec(VALUE))
+#define metamacro_if_eq15(VALUE) metamacro_if_eq14(metamacro_dec(VALUE))
+#define metamacro_if_eq16(VALUE) metamacro_if_eq15(metamacro_dec(VALUE))
+#define metamacro_if_eq17(VALUE) metamacro_if_eq16(metamacro_dec(VALUE))
+#define metamacro_if_eq18(VALUE) metamacro_if_eq17(metamacro_dec(VALUE))
+#define metamacro_if_eq19(VALUE) metamacro_if_eq18(metamacro_dec(VALUE))
+#define metamacro_if_eq20(VALUE) metamacro_if_eq19(metamacro_dec(VALUE))
+
+// metamacro_if_eq_recursive expansions
+#define metamacro_if_eq_recursive0(VALUE) \
+    metamacro_concat(metamacro_if_eq_recursive0_, VALUE)
+
+#define metamacro_if_eq_recursive0_0(...) __VA_ARGS__ metamacro_consume_
+#define metamacro_if_eq_recursive0_1(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_2(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_3(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_4(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_5(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_6(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_7(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_8(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_9(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_10(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_11(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_12(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_13(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_14(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_15(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_16(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_17(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_18(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_19(...) metamacro_expand_
+#define metamacro_if_eq_recursive0_20(...) metamacro_expand_
+
+#define metamacro_if_eq_recursive1(VALUE) metamacro_if_eq_recursive0(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive2(VALUE) metamacro_if_eq_recursive1(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive3(VALUE) metamacro_if_eq_recursive2(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive4(VALUE) metamacro_if_eq_recursive3(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive5(VALUE) metamacro_if_eq_recursive4(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive6(VALUE) metamacro_if_eq_recursive5(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive7(VALUE) metamacro_if_eq_recursive6(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive8(VALUE) metamacro_if_eq_recursive7(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive9(VALUE) metamacro_if_eq_recursive8(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive10(VALUE) metamacro_if_eq_recursive9(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive11(VALUE) metamacro_if_eq_recursive10(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive12(VALUE) metamacro_if_eq_recursive11(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive13(VALUE) metamacro_if_eq_recursive12(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive14(VALUE) metamacro_if_eq_recursive13(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive15(VALUE) metamacro_if_eq_recursive14(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive16(VALUE) metamacro_if_eq_recursive15(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive17(VALUE) metamacro_if_eq_recursive16(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive18(VALUE) metamacro_if_eq_recursive17(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive19(VALUE) metamacro_if_eq_recursive18(metamacro_dec(VALUE))
+#define metamacro_if_eq_recursive20(VALUE) metamacro_if_eq_recursive19(metamacro_dec(VALUE))
+
+// metamacro_take expansions
+#define metamacro_take0(...)
+#define metamacro_take1(...) metamacro_head(__VA_ARGS__)
+#define metamacro_take2(...) metamacro_head(__VA_ARGS__), metamacro_take1(metamacro_tail(__VA_ARGS__))
+#define metamacro_take3(...) metamacro_head(__VA_ARGS__), metamacro_take2(metamacro_tail(__VA_ARGS__))
+#define metamacro_take4(...) metamacro_head(__VA_ARGS__), metamacro_take3(metamacro_tail(__VA_ARGS__))
+#define metamacro_take5(...) metamacro_head(__VA_ARGS__), metamacro_take4(metamacro_tail(__VA_ARGS__))
+#define metamacro_take6(...) metamacro_head(__VA_ARGS__), metamacro_take5(metamacro_tail(__VA_ARGS__))
+#define metamacro_take7(...) metamacro_head(__VA_ARGS__), metamacro_take6(metamacro_tail(__VA_ARGS__))
+#define metamacro_take8(...) metamacro_head(__VA_ARGS__), metamacro_take7(metamacro_tail(__VA_ARGS__))
+#define metamacro_take9(...) metamacro_head(__VA_ARGS__), metamacro_take8(metamacro_tail(__VA_ARGS__))
+#define metamacro_take10(...) metamacro_head(__VA_ARGS__), metamacro_take9(metamacro_tail(__VA_ARGS__))
+#define metamacro_take11(...) metamacro_head(__VA_ARGS__), metamacro_take10(metamacro_tail(__VA_ARGS__))
+#define metamacro_take12(...) metamacro_head(__VA_ARGS__), metamacro_take11(metamacro_tail(__VA_ARGS__))
+#define metamacro_take13(...) metamacro_head(__VA_ARGS__), metamacro_take12(metamacro_tail(__VA_ARGS__))
+#define metamacro_take14(...) metamacro_head(__VA_ARGS__), metamacro_take13(metamacro_tail(__VA_ARGS__))
+#define metamacro_take15(...) metamacro_head(__VA_ARGS__), metamacro_take14(metamacro_tail(__VA_ARGS__))
+#define metamacro_take16(...) metamacro_head(__VA_ARGS__), metamacro_take15(metamacro_tail(__VA_ARGS__))
+#define metamacro_take17(...) metamacro_head(__VA_ARGS__), metamacro_take16(metamacro_tail(__VA_ARGS__))
+#define metamacro_take18(...) metamacro_head(__VA_ARGS__), metamacro_take17(metamacro_tail(__VA_ARGS__))
+#define metamacro_take19(...) metamacro_head(__VA_ARGS__), metamacro_take18(metamacro_tail(__VA_ARGS__))
+#define metamacro_take20(...) metamacro_head(__VA_ARGS__), metamacro_take19(metamacro_tail(__VA_ARGS__))
+
+// metamacro_drop expansions
+#define metamacro_drop0(...) __VA_ARGS__
+#define metamacro_drop1(...) metamacro_tail(__VA_ARGS__)
+#define metamacro_drop2(...) metamacro_drop1(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop3(...) metamacro_drop2(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop4(...) metamacro_drop3(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop5(...) metamacro_drop4(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop6(...) metamacro_drop5(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop7(...) metamacro_drop6(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop8(...) metamacro_drop7(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop9(...) metamacro_drop8(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop10(...) metamacro_drop9(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop11(...) metamacro_drop10(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop12(...) metamacro_drop11(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop13(...) metamacro_drop12(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop14(...) metamacro_drop13(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop15(...) metamacro_drop14(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop16(...) metamacro_drop15(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop17(...) metamacro_drop16(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop18(...) metamacro_drop17(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop19(...) metamacro_drop18(metamacro_tail(__VA_ARGS__))
+#define metamacro_drop20(...) metamacro_drop19(metamacro_tail(__VA_ARGS__))
+
+#endif
diff --git a/Podfile.lock b/Podfile.lock
index 2513fca..9237289 100644
--- a/Podfile.lock
+++ b/Podfile.lock
@@ -7,7 +7,7 @@ DEPENDENCIES:
   - Specta (~> 0.2.1)
 
 SPEC CHECKSUMS:
-  Expecta: dbc4a27fabb853bdd2e907e33f11ee43a9a47d0c
-  Specta: 2d06220591110c6d9757d8be8ecf8e63aa40dc2a
+  Expecta: 578e0c29df79a96a159187599e2def686ef6a66c
+  Specta: 9141310f46b1f68b676650ff2854e1ed0b74163a
 
-COCOAPODS: 0.29.0
+COCOAPODS: 0.33.1
diff --git a/Specs/ASTChainSpec.m b/Specs/ASTChainSpec.m
new file mode 100644
index 0000000..949b561
--- /dev/null
+++ b/Specs/ASTChainSpec.m
@@ -0,0 +1,57 @@
+//
+//  ASTChainSpec.m
+//  Asterism
+//
+//  Created by Robert Böhnke on 22/05/14.
+//  Copyright (c) 2014 Robert Böhnke. All rights reserved.
+//
+
+#import "Asterism.h"
+
+SpecBegin(ASTChain)
+
+describe(@"with one argument", ^{
+    it(@"should be transparent", ^{
+        NSArray *objects = @[];
+
+        expect(ASTChain(ASTSize(objects))).to.equal(ASTSize(objects));
+    });
+});
+
+describe(@"with multiple arguments", ^{
+    it(@"should pass the result of the previous statement into _", ^{
+        NSUInteger result = ASTChain(
+            ASTWithout(@[ @1, @2, @3, @4 ], @1),
+            ASTWithout(_, @2),
+            ASTWithout(_, @3),
+            ASTSize(_),
+            (_ + 2)
+        );
+
+        expect(result).to.equal(3);
+    });
+
+    it(@"should allow blocks withing ASTChain statements", ^{
+        NSUInteger result = ASTChain(
+            ASTTail(@[ @"Bonjour" @"Hej", @"Hallo", @"Hello" ]),
+            ASTFilter(_, ^BOOL(NSString *greeting) {
+                return greeting.length == 5;
+            }),
+            ASTSize(_)
+        );
+
+        expect(result).to.equal(2);
+    });
+
+    it(@"should support normal objective-c messaging", ^{
+        NSString *result = ASTChain(
+            [NSString string],
+            [_ stringByAppendingString:@"Hello "],
+            [_ stringByAppendingString:@"World!"]
+        );
+
+        expect(result).to.equal(@"Hello World!");
+    });
+});
+
+SpecEnd