Improve error message when using ',' in struct declarations. #1920

releasenotes.md

@@ -14,6 +14,7 @@
 - Experimental change from `[*]` to `[?]`
 - Warn on if-catch with just a `default` case.
 - Compile time array inc/dec.
+- Improve error message when using ',' in struct declarations. #1920
 
 ### Fixes
 - Fix issue requiring prefix on a generic interface declaration.

src/compiler/parse_global.c

@@ -1629,6 +1629,10 @@ static bool parse_struct_body(ParseContext *c, Decl *parent)
 			{
 				RETURN_PRINT_ERROR_AT(false, member, "'inline' can only be applied to a single member, so please define it on its own line.");
 			}
+			if (token_is_any_type(c->tok))
+			{
+				RETURN_PRINT_ERROR_LAST("Did you accidentally use ',' rather than ';' between your declarations?");
+			}
 		}
 		Decl **members = parent->strukt.members;
 		unsigned last_index = vec_size(members) - 1;

test/test_suite/struct/struct_comma.c3

@@ -0,0 +1,7 @@
+import std::io;
+
+ struct Test
+ {
+    int a, // #error: Did you accidentally use ','
+    int b,
+ }