[Issue 21444] New: bad string concat in static assert message

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21444

          Issue ID: 21444
           Summary: bad string concat in static assert message
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: diagnostic
          Severity: trivial
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: b2.temp at gmx.com

See
https://github.com/dlang/phobos/blob/2c0660141748a13637ff473cbb7b0d52eb1c44db/std/traits.d#L1416

```
static assert(0, func[0].stringof ~ "is not a function");
```

The should be a space as first char of the "is not a function" literal

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