[Issue 16540] Attributes do not propagate correctly in lazy params

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16540

--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
Added test case to ensure it keeps working:

https://github.com/dlang/dmd/pull/6776

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