https://bugs.llvm.org/show_bug.cgi?id=42406
Bug ID: 42406
Summary: Valid code fails with "reference to local variable
declared in enclosing function"
Product: clang
Version: 8.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: rea...@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
The following code fails to compile with Clang 4.0.0 and newer. The last
version that can compile this code is 3.9.1 (tested on godbolt.org.)
template <int>
struct S {
constexpr int val() const { return 0; }
};
template <typename = void>
S<0> foo()
{
S<0> s;
return S<s.val()>{};
}
int main()
{
foo();
}
Build with -std=c++11 or higher.
Error message:
error: reference to local variable 's' declared in enclosing function 'foo'
return S<s.val()>{};
^
note: in instantiation of function template specialization 'foo<void>'
requested here
foo();
^
note: 's' declared here
S<0> s;
^
1 error generated.
When making foo() a non-template, the error disappears:
S<0> foo()
{
S<0> s;
return S<s.val()>{};
}
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