[Issue 23302] std.algorithm.comparison.predSwitch producing SwitchError with error message as the filename

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23302

Steven Schveighoffer <schveiguy at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |schveiguy at gmail.com
          Component|phobos                      |druntime
           Hardware|x86_64                      |All
                 OS|Linux                       |All

--- Comment #1 from Steven Schveighoffer <schveiguy at gmail.com> ---
This can be fixed by changing `SwitchError` to take a msg, and then changing
the hook to forward that default message as well (no compiler code need be
changed, all druntime changes).

See hook entry point here:
https://github.com/dlang/dmd/blob/33e8f2ce32831d509fb9052227ca9f33e132a29b/druntime/src/core/internal/switch_.d#L189

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