[Issue 22028] importC: Parser accepts initializers for struct members

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22028

--- Comment #1 from Iain Buclaw <ibuclaw at gdcproject.org> ---
Checking whether this affects bit-fields, the parser finds the syntax confusing
enough to emit an error (errors are emitted after WIP modifications to accept
bit-field syntax in cparseDeclaration)
---
struct S
{
  int bf1 : 4 = 5;  // Error: cannot modify constant `4`
  int : 4 = 5;      // Error: cannot modify constant `4`

  int bf2 = 5 : 4;  // Error: `=`, `;` or `,` expected (at position `:`)
  int = 5 : 4;      // Error: `=`, `;` or `,` expected (at position `=` ???)
};

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