this gives me "Smart cast not possible: t is a mut...

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[altmind]

this gives me "Smart cast not possible: t is a mutable property that can change over time"

[Andreas Sinz]

Thats because the kotlin compiler cannot guarantee, that another thread doesn't do t = null inbetween t != null and t.interrupt(). If you need to do anything with t if its not null, you can use t?.let { /* do work */ } too