[Issue 19518] New: std.range.front() returns a dchar when applied to char[]

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19518

          Issue ID: 19518
           Summary: std.range.front() returns a dchar when applied to
                    char[]
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: madric at gmail.com

Consider the following program:
```
import std.range;
void main()
{
        char[] data = ['a', 'b', 'c'];
        char a = data.front();
}
```

While std.range.front() works fine with most array types, there seems to be a
problem with using char[] types. The above program actually produces a compiler
error:
```
onlineapp.d(5): Error: cannot implicitly convert expression `front(data)` of
type `dchar` to `char`

```

The workaround is to not use std.range.front(), but rather use basic array
indexing, e.g. `data[0]`.

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