https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92910
Bug ID: 92910
Summary: Valid lambda inside variadic template does not compile
Product: gcc
Version: 7.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: soko.slav at yandex dot ru
Target Milestone: ---
Code:
template <class ... Ts>
void foo()
{
(
[]
{
static_cast<Ts*>(nullptr);
}()
, ...
);
}
template void foo<>();
fails to compile with message
In lambda function:
<source>:7:13: error: parameter packs not expanded with '...':
static_cast<Ts*>(nullptr);
<source>:7:13: note: 'Ts'
<source>: In function 'void foo()':
<source>:8:10: error: operand of fold expression has no unexpanded parameter
packs
up to gcc-7.5 (x86-64)
compiles on gcc-8.1 and later
Tested locally and on https://godbolt.org/z/F2jR9U
