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syntax error caused by unconditional __has_extension usage #536

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@firewave
firewave
opened on Sep 7, 2025

Encountered while working on #438.

# if __has_extension(cxx_rvalue_references)
# endif
a.cpp:1: syntax error: failed to evaluate #if condition, undefined function-like macro invocation: __has_extension( ... )

See
https://gcc.gnu.org/onlinedocs/cpp/_005f_005fhas_005fextension.html

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