JS_IR: fix typecheck corner case

Consider `fun <E : I> foo(a: Any?) = a as? E`, where I is an interface.
This check used to fail, because the `a == null` was missing, and
the `isInterface` stdlib method crashes if the first argument
is null. This change adds the null check.

Also this change prettifies the instance check in case of type parameter
left operand.

This commit is contained in:

Anton Bannykh

2019-12-13 18:29:22 +03:00

committed by

Anton Bannykh

parent 9a971172c9

commit d6fcde7316

10 changed files with 47 additions and 5 deletions

									
										compiler/testData/codegen/box/casts/nullableSafeCastToTypeParameterWithInterfaceUpperBound.kt
									
Vendored

		+5
		
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				@@ -0,0 +1,5 @@

				interface I

				fun <E: I> foo(a: Any?): E? = a as? E

				fun box() = foo<I>(null) ?: "OK"