[llvm-bugs] [Bug 39964] New: Unclear error message

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39964

            Bug ID: 39964
           Summary: Unclear error message
           Product: clang
           Version: 7.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jvapen at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

test.cpp
========
struct A
{
    A() = default;
    A(A&&) {}
};

struct B : A
{
    B() = default;
    B(B&&) noexcept = default;

    A a;
};

Error message:
==============
exception specification of explicitly defaulted move constructor does not match
the calculated one

see https://gcc.godbolt.org/z/lvQ6a_

The error message itself doesn't help me solving the problem.
I now know that B can't be nothrow-move-constructable.
However, I don't get told why this is the case.
For this specific case, I rather add 'noexcept' to class A, than removing it
from B.
Knowing where the 'calculated one' gets the different result from, allows me to
do so.

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