Bug 23115 – [REG 2.100] AssertError@src/dmd/dtemplate.d(7397): can only re-append from non-root to root module

Triggers when using a debug build of the compiler: --- /// imports/icecommon.d module imports.icecommon struct Single(T) { } struct Pair(L, R) { static if (is(R : Single!T, T)) bool opEquals(L, R)(Pair!(L, R)) const; } static assert(is( Pair!(Single!int, Single!double) )); --- /// imports/iceimport.d module imports.iceimport; import imports.icecommon; struct Import { Pair!(Single!int, Single!double) V; } struct Unused { Pair!(int, Single!(Pair!(Single!int, Single!double))) X; } --- /// ice.d module ice; import imports.icecommon; alias AliasSeq(T) = T; struct Struct(T) { AliasSeq!(T) field; } void fun() { import imports.iceimport; Struct!Import var; }

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