cor3ntin added inline comments.
================
Comment at: clang/test/SemaCXX/static-assert.cpp:287
+ static_assert((char16_t)L'ゆ' == L"C̵̭̯̠̎͌ͅť̺"[1], ""); // expected-error
{{failed}} \
+ // expected-note {{evaluates
to ''ゆ' (0x3086) == '̵' (0x335)'}}
+ static_assert(L"＼／"[1] == u'\xFFFD', ""); // expected-error {{failed}} \
----------------
hubert.reinterpretcast wrote:
> hubert.reinterpretcast wrote:
> > cor3ntin wrote:
> > > hubert.reinterpretcast wrote:
> > > > The C++23 escaped string formatting facility would not generate a
> > > > trailing combining character like this. I recommend following suit.
> > > >
> > > > Info on U+0335:
> > > > https://util.unicode.org/UnicodeJsps/character.jsp?a=0335
> > > >
> > > This is way outside the scope of the patch. The diagnostic output
> > > facility has no understanding of combining characters or graphemes and do
> > > not attempt to match std::print. It probably would be an improvement but
> > > this patch is not trying to modify how all diagnostics are printed. (all
> > > of that logic is in Diagnostic.cpp)
> > This patch is pushing the envelope of what appears in diagnostics. One can
> > also argue that someone writing
> > ```
> > static_assert(false, "\u0301");
> > ```
> > gets what they deserve, but that case does not have a big problem anyway
> > (because the provided message text appears after `: `).
> >
> > This patch increases the exposure of the diagnostic output facility to
> > input that it does not handle well. I disagree that it is outside the scope
> > of this patch to insist that it does not generate such inputs to the
> > diagnostic output facility (even if a possible solution is to modify the
> > diagnostic output facility first).
> @cor3ntin, do you have status quo examples for how grapheme-extending
> characters that are not already "problematic" in their original context are
> emitted in diagnostics in contexts where they are?
Are you looking for that sort of examples? https://godbolt.org/z/c79xWr7Me
That shows that clang has no understanding of graphemes
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D155610/new/
https://reviews.llvm.org/D155610
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