invalid defaulted copy constructor if a member is const

[llvmbot]

Bugzilla Link	10622
Resolution	FIXED
Resolved on	Aug 10, 2011 11:52
Version	unspecified
OS	Linux
Reporter	LLVM Bugzilla Contributor
CC	@DougGregor

Extended Description

Sorry if this is one of the "know to be missing" items, but there seems to be quiet a bit of support for "= default" already.

Clang complains when compiling

struct foo {
const int first;
constexpr foo(const foo&) = default;
};
void find_or_insert(const foo& __obj) {
foo x(__obj);
}

the error is

path_service.ii:3:13: error: constructor for 'foo' must explicitly initialize the const member 'first'
constexpr foo(const foo&) = default;
^
path_service.ii:2:13: note: declared here
const int first;
^
path_service.ii:6:7: note: implicit default copy constructor for 'foo' first required here
foo x(__obj);
^

[llvmbot]

It fails with the same error without the constexpr:

struct foo {
const int first;
foo(const foo&) = default;
};
void find_or_insert(const foo& __obj) {
foo x(__obj);
}

[DougGregor]

Fixed in Clang r137219.