aaron.ballman added inline comments.
================
Comment at: clang/docs/ReleaseNotes.rst:103-137
+- When describing the failure of static assertion of `==` expression, clang
prints the integer
+ representation of the value as well as its character representation when
+ the user-provided expression is of character type. If the character is
+ non-printable, clang now shows the escpaed character.
+ Clang also prints multi-byte characters if the user-provided expression
+ is of multi-byte character type.
+
----------------
cor3ntin wrote:
> aaron.ballman wrote:
> > cor3ntin wrote:
> > > @aaron.ballman One one hand this is nice, on the other hand maybe too
> > > detailed. What do you think?
> > I'm happy with it -- better too much detail than too little, but this
> > really helps users see what's been improved and why it matters.
> >
> > That said, I think `0x0A` and `0x1F30D` would arguably be better than
> > printing the values in decimal. For `\n`, perhaps folks remember that it's
> > decimal value 10, but nobody is going to know what `127757` means compared
> > to the hex representation (esp because the value is specified in hex with
> > the prefix printed in the error message). WDYT?
> For `wchar_t`, `charN_t` I think that makes sense.
> for `char`... hard to know, I think this is mostly useful for people who
> treat char as some kind of integer. I could go either way. using hex
> consistently seems reasonable
I don't insist on using hex, but I have a slight preference for using it
consistently everywhere. CC @cjdb for more opinions since this relates to user
experience of diagnostics.
================
Comment at: clang/test/SemaCXX/static-assert.cpp:280-287
+static_assert((char16_t)L'ゆ' == L"C̵̭̯̠̎͌ͅť̺"[1], ""); // expected-error
{{failed}} \
+ // expected-note {{evaluates
to ''ゆ' (12422) == '̵' (821)'}}
+static_assert(L"＼／"[1] == u'\xFFFD', ""); // expected-error {{failed}} \
+ // expected-note {{evaluates to
''／' (65295) == '�' (65533)'}}
+static_assert(L"⚾"[0] == U'🌍', ""); // expected-error {{failed}} \
+ // expected-note {{evaluates to ''⚾'
(9918) == '🌍' (127757)'}}
+static_assert(U"\a"[0] == (wchar_t)9, ""); // expected-error {{failed}} \
----------------
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D155610/new/
https://reviews.llvm.org/D155610
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