Bug 21589 – Mixing public and local selective imports causes behaviour differences

Relevent forum post: https://forum.dlang.org/post/[email protected] Code snippet 1: ``` import std; public import std.typecons : Nullable; import std.typecons : Nullable; alias T = Nullable!int; // onlineapp.Nullable or std.typecons.Nullable // depending on whether the public import exists or not pragma(msg, fullyQualifiedName!Nullable); // false if the public import exists, true otherwise. pragma(msg, isInstanceOf!(Nullable, T)); void main(){} ``` Code snippet 2: ``` import std; public import std.typecons : Nullable; import std.typecons : Nullable; alias T = Nullable!int; void fails() { // false pragma(msg, isInstanceOf!(Nullable, T)); } void passes() { // true import std.typecons : Nullable; pragma(msg, isInstanceOf!(Nullable, T)); } void main(){} ```

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