Incorrect treatment of consecutive ## operators #378

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Incorrect treatment of consecutive ## operators#378

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chrchr-github

opened on Oct 13, 2024

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From llvm/llvm-project#112122:

#define FOO(a, b, c) a ## b ## c, a ## ## c
FOO (x, , y)
FOO (x, 42, y)

Output:

xy  , x# "y"
x42y  , x# "y"

This diverges from both gcc and clang.

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1. firewave

   added

   bug

   on Jul 3, 2025

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