more cleanup in error messages

src/parser/error_messages.txt

@@ -98,6 +98,7 @@ program: AFTER CONJ2 VDASH
 goal: AFTER DDARROW VDASH
 goal: LBRACKET AFTER DDARROW VDASH
 program: AFTER DDARROW VDASH
+program: EXPORTDEF AFTER AFTER ARROW VDASH
 
 This infix operator expects a right hand side.
 
@@ -234,10 +235,16 @@ goal: LBRACKET AFTER COLON AFTER BIND VDASH
 goal: AFTER DDARROW FLOAT USE_SIG
 goal: LBRACKET AFTER DDARROW FLOAT USE_SIG
 program: AFTER DDARROW FLOAT USE_SIG
+goal: AFTER BIND VDASH
+goal: LPAREN USE_SIG
+program: EXPORTDEF AFTER AFTER ARROW LPAREN AFTER RPAREN VDASH
+program: EXPORTDEF AFTER AFTER VDASH
+program: EXPORTDEF AFTER AFTER LPAREN USE_SIG
+program: EXPORTDEF AFTER AFTER LPAREN AFTER FULLSTOP
+program: EXPORTDEF AFTER AFTER AFTER VDASH
 
 Term expected, got keyword.
 
-goal: LPAREN USE_SIG
 goal: LPAREN FAMILY_TILDE VDASH
 
 Mixfix symbol or term expected.
@@ -331,7 +338,6 @@ type (++) list A -> list A -> list A.
 program: RULE LPAREN USE_SIG
 program: RULE VDASH
 program: RULE IFF AFTER VDASH
-program: RULE LPAREN AFTER COLON VDASH
 program: RULE AFTER VDASH
 program: RULE BIND VDASH
 program: RULE BIND AFTER VDASH
@@ -340,6 +346,7 @@ program: RULE PIPE FLOAT USE_SIG
 program: RULE IFF VDASH
 program: RULE LPAREN AFTER RTRI VDASH
 program: RULE LPAREN AFTER RTRI FLOAT USE_SIG
+program: RULE LPAREN AFTER USE_SIG
 
 Malformed CHR rule declaration. Examples:
 rule (match this).
@@ -359,12 +366,11 @@ accumulate foo, bar.
 accumulate "foo/bar".
 
 goal: LBRACKET AFTER AFTER RPAREN
-
-Closing '[' with ')'.
-
 goal: LBRACKET PIPE VDASH
 goal: LBRACKET AFTER PIPE VDASH
 goal: LBRACKET AFTER CONJ2 VDASH
+goal: LBRACKET AFTER USE_SIG
+goal: LBRACKET AFTER BIND FLOAT USE_SIG
 
 List expected. Examples:
 [ this , that | More ].
@@ -450,29 +456,18 @@ program: FUNC VDASH
 program: FUNC AFTER VDASH
 program: FUNC AFTER AFTER RPAREN
 program: FUNC AFTER ARROW VDASH
+program: FUNC AFTER LPAREN FUNC AFTER FULLSTOP
+program: FUNC AFTER LPAREN FUNC VDASH
+program: FUNC AFTER LPAREN FUNC ARROW VDASH
 
 Predicate declaration expected. Examples:
 pred append i:list A, i:list A, o:list A.
 pred append i:list A i:list A o:list A.
 pred mapR i:list A, i:(pred i:A, o:B), o:list B.
 func map list A, (func A -> B) -> list B.
 
-program: EXPORTDEF AFTER LPAREN USE_SIG
-program: EXPORTDEF AFTER LPAREN AFTER FULLSTOP
-program: EXPORTDEF AFTER AFTER ARROW VDASH
-program: EXPORTDEF AFTER AFTER ARROW LPAREN AFTER RPAREN VDASH
-program: EXPORTDEF AFTER AFTER VDASH
-program: EXPORTDEF AFTER AFTER LPAREN USE_SIG
-program: EXPORTDEF AFTER AFTER LPAREN AFTER FULLSTOP
-program: EXPORTDEF AFTER AFTER AFTER VDASH
-program: EXPORTDEF VDASH
 program: EXPORTDEF AFTER TYPE
-program: EXPORTDEF AFTER LPAREN PRED VDASH
-program: EXPORTDEF AFTER AFTER LPAREN PRED IO_COLON AFTER FULLSTOP
-program: EXPORTDEF AFTER LPAREN PRED IO_COLON AFTER FULLSTOP
-program: EXPORTDEF AFTER LPAREN FUNC VDASH
-program: EXPORTDEF AFTER LPAREN FUNC AFTER FULLSTOP
-program: EXPORTDEF AFTER LPAREN FUNC ARROW VDASH
+program: EXPORTDEF VDASH
 
 Definition export directive expected (Teyjus compatibility, ignored by Elpi).
 Examples:
@@ -546,6 +541,14 @@ sigma X Y Z\ p X, q Y Z
 
 goal: LPAREN FLOAT COLON AFTER IO_COLON
 goal: LPAREN FLOAT COLON VDASH
+goal: AFTER COLON VDASH
+goal: AFTER COLON AFTER RPAREN
+goal: AFTER COLON AFTER BIND VDASH
+goal: AFTER COLON AFTER BIND FLOAT USE_SIG
+goal: LBRACKET AFTER COLON VDASH
+goal: LPAREN AFTER COLON VDASH
+goal: LPAREN AFTER COLON AFTER IO_COLON
+goal: AFTER COLON LPAREN USE_SIG
 
 Illformed type cast.
 Examples:
@@ -556,3 +559,13 @@ lam (x : ty \ t)
 program: LPAREN FLOAT COLON AFTER RPAREN VDASH
 
 You cannot ascribe a type on the head predicate.
+
+goal: AFTER COLON LPAREN PRED VDASH
+goal: AFTER COLON AFTER LPAREN FUNC ARROW AFTER ARROW
+goal: AFTER COLON LPAREN AFTER IO_COLON
+goal: AFTER COLON LPAREN FUNC ARROW AFTER ARROW
+
+Anonymous predicate declaration expected.
+Examples:
+(pred i:ty, o:ty)
+(pred)