karies added a comment.
Two comments:
- I think the part `Val.getBitWidth() == 64` likely needs rewording, although I
don't know how
- I can show the motivation, not sure whether that qualifies as a test case:
$ echo 'template <unsigned long long> struct S{}; S<(unsigned long long)-1> s
= 42;' | clang++ -fsyntax-only -std=c++14 -x c++ -
<stdin>:1:69: error: no viable conversion from 'int' to 'S<(unsigned long
long)-1>'
template <unsigned long long> struct S{}; S<(unsigned long long)-1> s = 42;
^ ~~
<stdin>:1:38: note: candidate constructor (the implicit copy constructor) not
viable: no known conversion from 'int' to 'const S<18446744073709551615> &' for
1st argument
template <unsigned long long> struct S{}; S<(unsigned long long)-1> s = 42;
^ ~~
<stdin>:1:38: note: candidate constructor (the implicit move constructor) not
viable: no known conversion from 'int' to 'S<18446744073709551615> &&' for 1st
argument
template <unsigned long long> struct S{}; S<(unsigned long long)-1> s = 42;
^ ~~
1 error generated.
The following shows that the name clang usew for diagnostics
(`S<18446744073709551615> &`) is actually invalid:
$ echo 'template <unsigned long long> struct S{}; S<18446744073709551615> a;'
| clang++ -fsyntax-only -std=c++14 -x c++ -
<stdin>:1:45: warning: integer literal is too large to be represented in a
signed integer type, interpreting as unsigned [-Wimplicitly-unsigned-literal]
template <unsigned long long> struct S{}; S<18446744073709551615> a;
^
1 warning generated.
My goal is for clang to print a valid class name, which means this should be
spelled S<18446744073709551615ull>`.
Repository:
rL LLVM
https://reviews.llvm.org/D34912
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