catch case with only linenumbernode (#53)

* catch case with only linenumbernode

* don't use only

* don't run that test on 1.0

* rewrite because of patch versions

src/Chain.jl

@@ -182,7 +182,9 @@ end
 
 function rewrite_chain_block(block)
     block_expressions = block.args
-    isempty(block_expressions) && error("No expressions found in chain block.")
+    isempty(block_expressions) || 
+        (length(block_expressions) == 1 && block_expressions[] isa LineNumberNode) &&
+        error("No expressions found in chain block.")
 
     reconvert_docstrings!(block_expressions)
 

test/runtests.jl

@@ -215,10 +215,12 @@ end
 
 @testset "invalid single arg versions" begin
     # empty
-    @test_throws LoadError eval(quote
-        @chain begin
-        end
-    end)
+    if !(VERSION < v"1.1") # weird interaction with test macros in 1.0
+        @test_throws LoadError eval(quote
+            @chain begin
+            end
+        end)
+    end
 
     # rvalue _ errors
     @test_throws ErrorException eval(quote