[Issue 16208] moduleinfo importedModules contains needless duplicates

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=16208

--- Comment #6 from Steven Schveighoffer <schveiguy at yahoo.com> ---
Excellent! Thank you Rainer. It's possible we can clean the cycle detection
code a bit now that we don't have this problem (I believe I am using a hash at
runtime to deduplicate).

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