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C++ PATCH for c++/72415 (concepts ICE with fold-expression constraint)


Substituting into the fold-expression was producing an
EXPR_PACK_EXPANSION, but it would be better to keep it as a
fold-expression.  tsubst_unary_left_fold et al try to do this, but
weren't recognizing the case where tsubst_pack_expansion returns a
TREE_VEC containing a single pack expansion.  In that case, let's just
return the pack expansion without the TREE_VEC, as we do earlier in
tsubst_pack_expansion for similar situations.

Tested x86_64-pc-linux-gnu, applying to trunk and 6.

Attachment: 72415.diff
Description: Text document


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