[Issue 23607] ICE caused by an invalid pipeline involving std.conv.to!string

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23607

--- Comment #1 from Basile-z <b2.temp at gmx.com> ---
reduced:

```
template to(T)
{
    void to(T)(){}
}

alias comb = to!int.bad!0;    
```

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