https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107953
Bug ID: 107953
Summary: Greater-than operator misparsed inside a lambda
expression used as a template argument
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: majerech.o at gmail dot com
Target Milestone: ---
template <auto>
void
f() { }
constexpr auto g = f<[] (int x, int y) { return x > y; }>;
This produces the following diagnostic:
<source>: In lambda function:
<source>:5:50: error: expected ';' before '>' token
5 | constexpr auto g = f<[] (int x, int y) { return x > y; }>;
| ^~
| ;
<source>:5:51: error: expected primary-expression before '>' token
5 | constexpr auto g = f<[] (int x, int y) { return x > y; }>;
| ^
ASM generation compiler returned: 1
<source>: In lambda function:
<source>:5:50: error: expected ';' before '>' token
5 | constexpr auto g = f<[] (int x, int y) { return x > y; }>;
| ^~
| ;
<source>:5:51: error: expected primary-expression before '>' token
5 | constexpr auto g = f<[] (int x, int y) { return x > y; }>;
| ^
Godbolt link to the above: https://godbolt.org/z/KG6d5E6ev
Changing the body to return (x > y); makes the error go away as a workaround.
So I speculate that the greater-than operator is misparsed as the end of the
template argument list.
