https://bugs.llvm.org/show_bug.cgi?id=47684
Bug ID: 47684
Summary: crash after hiding of class-scope using shadow
declaration in a template
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: richard-l...@metafoo.co.uk
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
Testcase causes a broken AST and a crash in IR generation:
struct A {
void f();
};
template<typename T> struct B : A {
using A::f;
static constexpr auto p = &B::f;
void f();
};
auto v = B<int>::p;
The problem is that we inject a using shadow declaration for 'using A::f', and
then try to retroactively remove it (after it was already used) when we see the
later declaration of the member 'void f()'. Then during template instantiation,
we don't instantiate the using-shadow declaration (it was already removed), so
the '&B::f' has nothing to refer to.
Perhaps the best thing to do would be to reject any case where the
UsingShadowDecl is referenced before being hidden (on the basis that this is a
"reordering the declarations changes the meaning of the class" case).
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