clang-format fails to detect trailing return syntax within a macro

[chandlerc]

Bugzilla Link	48320
Version	unspecified
OS	All

Extended Description

Given:

auto TestWithoutMacro() -> int { return 42; }

#define SOME_X_MACRO(NAME) \
  auto NAME() -> int { return 42; }

SOME_X_MACRO(TestWithMacro)

Running clang-format --style=Google test.cpp produces:

auto TestWithoutMacro() -> int { return 42; }

#define SOME_X_MACRO(NAME) \
  auto NAME()->int { return 42; }

SOME_X_MACRO(TestWithMacro)

The -> inside the macro body should retain the spaces around it, as this isn't a member access, this is a trailing return type.

This may be related to #41495 but is pretty clearly different from #42180 which is mentioned there.

[rymiel]

Patch: https://reviews.llvm.org/D141811