[llvm-bugs] [Bug 42203] New: clang accepts invalid code

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42203

            Bug ID: 42203
           Summary: clang accepts invalid code
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zhonghao at pku.org.cn
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

My clang is 9.0.0, and the code is:

enum class A : unsigned long long {
 z = (unsigned long long)-1
};
const A c{ A::z };
template <enum A : unsigned long long > struct Q {};
Q<c> j;

clang accepts the code. ICC rejects it:

<source>(5): error: an opaque enum declaration cannot be part of another
declaration

  template <enum A : unsigned long long > struct Q {};

                 ^

<source>(6): error: argument of type "A" is incompatible with template
parameter of type "A"

  Q<c> j;

    ^

compilation aborted for <source> (code 2)

Compiler returned: 2

gcc also rejects it:

<source>:5:39: error: expected ';' or '{' before '>' token

    5 | template <enum A : unsigned long long > struct Q {};

      |                                       ^

<source>:5:39: error: expected class-key before '>' token

<source>:6:4: note: invalid template non-type parameter

    6 | Q<c> j;

      |    ^

Compiler returned: 1

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