[Issue 17407] New: [REG] __traits(compiles) triggers assertion failure

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17407

          Issue ID: 17407
           Summary: [REG] __traits(compiles) triggers assertion failure
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: mathias.lang at sociomantic.com

```
bool foo ()
{
    void delegate ( ) longest_convert;
    return __traits(compiles, longest_convert = &doesNotExists);
}

static assert(!foo);
```

This code result in an assertion failure with DMD v2.075.0-devel-f234dde37
(master) and probably earlier.
The assertion in question is
https://github.com/dlang/dmd/blob/f234dde373acc2d6b4c32656c13edba764a925a5/src/ddmd/dinterpret.d#L7125
It only shows up with a debug build of DMD, as release builds don't have
`assert` on.

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