[PATCH] D133674: [Lex/DependencyDirectivesScanner] Handle the case where the source line starts with a `tok::hashhash`

Mon Sep 12 12:52:41 PDT 2022

akyrtzi added a comment.

In D133674#3784602 <https://reviews.llvm.org/D133674#3784602>, @jansvoboda11 wrote:

> Could you explain why this is necessary and even correct? I'd expect Clang to give an error when seeing `##` in this position, and I'd expect the scanner to do the same.

`##` is lexed as `tok::hashhash`; it is ignored by the preprocessor (it is not treated as the start of a preprocessor directive) and passed on to the parser to interpret, like any other token.

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  https://reviews.llvm.org/D133674/new/

https://reviews.llvm.org/D133674