Duplicate `long` typedef disallowed

[ehaas]

Duplicate typedefs should be allowed if they're equal. This one is weird; it seems it only happens for long (not long int or unsigned long or any other specifier):

typedef long foo;
typedef long foo;

test.c:2:17: error: expected identifier or '('
typedef long foo;
                ^

[ehaas]

Happens because the existing typedef we find here: https://github.com/Vexu/arocc/blob/8ab72a4b1a4ff445b39b1f6d23fe2cbe59f37763/src/aro/Parser.zig#L2069

Gets combined with long to form a long long specifier here: https://github.com/Vexu/arocc/blob/8ab72a4b1a4ff445b39b1f6d23fe2cbe59f37763/src/aro/Parser.zig#L2070

That also led me to suspect other patterns could trigger it:

typedef double foo;
typedef long foo;

test.c:2:17: error: expected identifier or '('
typedef long foo;
                ^

[aidenfoxivey]

Is there error message here also considered a bug? It seems pretty vague - like I wouldn't understand it by default.

[Vexu]

The bug here is that there shouldn't be any errors.