[Issue 21437] New: const(char*) variable matches both const(char)[] and const(char)*

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21437

          Issue ID: 21437
           Summary: const(char*) variable matches both const(char)[] and
                    const(char)*
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: elpenguino+D at gmail.com

```
void fun(const(char)[] a) {}
void fun(const(char)* a) {}

const(char*) a = "a";

void main() {
    fun(a);
}
```

Without the literal to initialize it, it chooses fun(const(char)*) as expected.
With it, the compiler thinks both match and cannot choose. It should always
choose fun(const(char)*).

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