https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68530
Bug ID: 68530
Summary: [C++14] sorry, unimplemented: unexpected AST of kind
loop_expr
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: lucdanton at free dot fr
Target Milestone: ---
Possibly related to PR c++/68206, which could also be exhibiting both this and
a potentially unrelated ICE.
$ g++-trunk --version
g++-trunk (GCC) 6.0.0 20151125 (experimental)
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ cat main.cpp
struct thing {
void foo() {}
};
template<typename>
constexpr int count()
{
auto item = thing {};
for(; (item.foo(), false););
return 0;
}
int main()
{
static_assert( count<int>() == 0, "" );
}
$ g++-trunk -std=c++14 main.cpp
main.cpp: In function 'int main()':
main.cpp:15:5: error: non-constant condition for static assertion
static_assert( count<int>() == 0, "" );
^~~~~~~~~~~~~
main.cpp:15:30: error: 'constexpr int count() [with <template-parameter-1-1> =
int]' called in a constant expression
static_assert( count<int>() == 0, "" );
^
main.cpp:6:15: note: 'constexpr int count() [with <template-parameter-1-1> =
int]' is not usable as a constexpr function because:
constexpr int count()
^~~~~
main.cpp:6:15: sorry, unimplemented: unexpected AST of kind loop_expr
main.cpp:6: confused by earlier errors, bailing out
