| Issue |
87811
|
| Summary |
Document implementation-defined behavior with UCN escape sequences in C
|
| Labels |
documentation,
c99
|
| Assignees |
|
| Reporter |
AaronBallman
|
A universal character name (UCN) is a kind of escape sequence. C99 6.4.4.4p10 has this to say: ... The value of an integer character constant containing more than one character (e.g., 'ab'), or containing a character or escape sequence that does not map to a single-byte execution character, is implementation-defined. ...
Clang [defines the implementation-defined behavior](https://github.com/llvm/llvm-project/blob/c7eede5d4c1c8e0c20337f3f3c9003f59fe5ccd5/clang/lib/Lex/LiteralSupport.cpp#L1734) in C to be the same as the [required behavior](https://eel.is/c++draft/lex.ccon#3.1.sentence-2) in C++.
We should document this outside of the source code.
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