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[NI] Make subtyping algorithm more robust to error types

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During subtyping/incorporation we transform types (e.g. changing nullability,
 form of the type) and, basically, we're doing this to some FIXPOINT.
 It's important that we use `KotlinType.hashCode()` to compare types, but
 for error types hashCode is a hashCode of its supertype and, for example,
 `makeNullableAsSpecified` method recreate type every time. So, we continue
 to generate new constraints and we'll never stop incorporation algorithm
This commit is contained in:
Mikhail Zarechenskiy
2018-06-07 11:48:16 +03:00
parent 1ee37b1772
commit 9891f562cc
15 changed files with 94 additions and 20 deletions
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compiler/testData/diagnostics/tests/inference/recursiveLocalFuns/selfCall.kt
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+1 -1
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@@ -3,7 +3,7 @@ fun foo() {
fun bar1() = <!TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM!><!NI;DEBUG_INFO_MISSING_UNRESOLVED!>bar1<!>()<!>
fun bar2() = 1 <!NI;OVERLOAD_RESOLUTION_AMBIGUITY!>+<!> <!TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM!><!NI;DEBUG_INFO_MISSING_UNRESOLVED!>bar2<!>()<!>
fun bar3() = id(<!TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM!><!NI;DEBUG_INFO_MISSING_UNRESOLVED!>bar3<!>()<!>)
fun <!NI;IMPLICIT_NOTHING_RETURN_TYPE!>bar3<!>() = id(<!TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM!><!NI;DEBUG_INFO_MISSING_UNRESOLVED!>bar3<!>()<!>)
}
fun <T> id(x: T) = x