[Issue 18646] Recursive template expansion incorrectly reported for certain templated classes

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18646

--- Comment #5 from Iain Buclaw <ibuclaw at gdcproject.org> ---
Extra testcase
---
struct Template(int i) { }
uint f()
{
    Template!(1) x;
    return 0;
}
immutable constant = f();
alias X = Template!constant;

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