[Issue 22875] New: importC: can't assign const typedef with pointers to non-const one

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22875

          Issue ID: 22875
           Summary: importC: can't assign const typedef with pointers to
                    non-const one
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: duser at neet.fi

typedef union value_u {
        void *p;
} value_t;
typedef struct data_s {
        void *p;
} data_t;
void fn()
{
        value_t a;
        const value_t b;
        // Error: cannot implicitly convert expression `b` of type
`const(value_u)` to `value_u`
        a = b;
        data_t aa;
        const data_t bb;
        // Error: cannot implicitly convert expression `bb` of type
`const(data_s)` to `data_s`
        aa = bb;
}

- if "void *p" is made a non-pointer type, the error disappears
- if the const variables are changed to use the original name instead of the
typedef, the error disappears

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