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Fix type inference issues for 'if' and 'when'.

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Use 'expectedType' (when present) as an explicit type argument for a special construct call.
Unfortunately, this approach can't be used for elvis due to other elvis-related inference hacks.
Fixes KT-10807, KT-10811.
This also affects KT-6189: now we can infer proper type for 'if'.

If type inference for special call failed, and we found no type errors in sub-expressions,
report TYPE_INFERENCE_FAILED_ON_SPECIAL_CONSTRUCT error.
This (and the hack above) fixes KT-10809: code no longer compiles.
This commit is contained in:
Dmitry Petrov
2016-01-26 21:20:24 +03:00
parent e3e463ef70
commit 9db3440e72
28 changed files with 498 additions and 18 deletions
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compiler/testData/diagnostics/tests/when/kt10811.txt
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package
public fun </*0*/ T> none(): None<T>
public fun test1(): Maybe<kotlin.String?>
public fun test2(): Maybe<kotlin.String?>
public fun test3(): Maybe<kotlin.String?>
public fun test4(): Maybe<kotlin.String?>
public interface Maybe</*0*/ T> {
public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
}
public final class None</*0*/ T> : Maybe<T> {
public constructor None</*0*/ T>()
public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
}
public final class Some</*0*/ T> : Maybe<T> {
public constructor Some</*0*/ T>(/*0*/ value: T)
public final val value: T
public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
}