[Issue 21882] [ICE][dip1021] src/dmd/escape.d(1850): Assertion failure

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21882

--- Comment #2 from Iain Buclaw <ibuclaw at gdcproject.org> ---
(In reply to Iain Buclaw from comment #1)
> Reduced test that compiles with -preview=dip1000, but not dip1021.
Further reduced:
---
void buildPath(char[][])
{   
    struct ByCodeUnitImpl
    {
        auto opIndex(size_t ) { }
    }
    assert(isRandomAccessRange!ByCodeUnitImpl);
}

enum isRandomAccessRange(R) = is(typeof(lvalueOf!R[1]));

ref T lvalueOf(T)();
---

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