https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118073
Bug ID: 118073
Summary: Bad diagnostic: 'nontype_argument_pack' not supported
by dump_expr
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: blubban at gmail dot com
Target Milestone: ---
template<int... Ns>
struct index_sequence {};
void foo()
{
index_sequence<5> bar = index_sequence<1>();
}
No flags needed.
Expected:
<source>: In function 'void foo()':
<source>:6:29: error: conversion from 'index_sequence<1>' to non-scalar type
'index_sequence<5>' requested
6 | index_sequence<5> bar = index_sequence<1>();
| ^~~~~~~~~~~~~~~~~~~
Actual:
<source>: In function 'void foo()':
<source>:6:29: error: conversion from 'index_sequence<'nontype_argument_pack'
not supported by dump_expr<expression error>>' to non-scalar type
'index_sequence<'nontype_argument_pack' not supported by dump_expr<expression
error>>' requested
6 | index_sequence<5> bar = index_sequence<1>();
| ^~~~~~~~~~~~~~~~~~~
GCC gives the expected error in gcc 4.4 through 7.x (older untested, Godbolt
coverage is spotty below 4.5); gives a slightly different error in 8.x and 9.x,
and gives this output in 10.x through 14.x and trunk-20241216.
https://godbolt.org/z/ohK3M69s7
