error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘{’ token

1. You seem to be including one C file from anther. #include should normally be used with header files only.

2. Within the definition of struct ast_node you refer to struct AST_NODE, which doesn't exist. C is case-sensitive.

AST_NODE* Statement(AST_NODE* node)

is missing a semicolon (a major clue was the error message "In function ‘Statement’: ...") and so is line 24,

   return node

(Once you fix those, you will encounter other problems, some of which are mentioned by others here.)

I encountered the same problem in the code and What I did is I found out all the changes I have made from the last correct compilation. And I have observed one function declaration was without ";" and also it was passing a value and I have declared it to pass nothing "void". this method will surely solve the problem for many.

Viscon