windows-rdl / clang: propget support

[Copilot]

COM virtual methods annotated with [propget] in their MIDL-generated block comment now emit #[special] in the generated RDL.

Before:

struct __declspec(uuid("cd33ad7d-cb91-471d-a494-6a178012a31f"))
IFoo {
    virtual /* [id][helpstring][propget] */ unsigned int __stdcall get_Count() = 0;
};

interface IFoo {
    fn get_Count(&self) -> u32;
}

After:

interface IFoo {
    #[special]
    fn get_Count(&self) -> u32;
}

Changes

• clang/interface.rs — Added MethodModifiers struct with MethodModifiers::from_tokens() that scans the method's token stream up to (not past) the function name, detecting [propget] in any CXToken_Comment token. The MethodModifiers doc comment now accurately describes these as MIDL attributes, noting that propget indicates a property accessor function. InterfaceMethod gains an is_propget field; write() emits #[special] when set.
• roundtrip/propget.h / propget.rdl — New roundtrip golden test covering a method with [propget], one with an unrelated comment, and one with no comment.

[Kenny Kerr (kennykerr)]

Copilot this test is redundant - the roundtrip test validates this.

[Copilot]

Removed in 37bdbf2.

[Rafael Rivera (riverar)]

Copilot Check out my comments above.