[Bug c++/106348] New: c++modules: invalid syntax accepted

[bugzilla.gcc at me dot benboeckel.net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106348

            Bug ID: 106348
           Summary: c++modules: invalid syntax accepted
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bugzilla.gcc at me dot benboeckel.net
  Target Milestone: ---

Source code:

```cpp
export module foo;
export import foo:part; // this line

export constexpr int m = 0;
```

Apparently line 2 should be `export import :part;` and the syntax as shown is
ill-formed. GCC doesn't reject it.