Nikolay Lunyak
f0720c1d12
The compiler should only report diagnostics for
comparisons over builtins and identity-less types,
other incompatibilities should be reported
via inspections.
It's ok that in `equalityChecksOnIntegerTypes`
instead of `EQUALITY_NOT_APPLICABLE_WARNING` we get
`EQUALITY_NOT_APPLICABLE`, because
`ProperEqualityChecksInBuilderInferenceCalls`
is already active by default.
This change also replaces the notion of a representative superclass
with the least upper bound.
This makes complex types like
intersection/flexible transparent to
RULES1-based compatibility checks.
One way to look at it is to think
that this is an automatic way of handling
type parameters: automatic picking of
"interesting" bounds, and checking them against one another.
Note that `TypeIntersector.intersectTypes`
for `Int` and `T` where `T` is a type parameter
may return both `{Int & T}` or `null`
depending on `T`-s bounds. At the same time,
for type parameters `T` and `K` it will
always return `{T & K}`.
`ConeTypeIntersector.intersectTypes`, on the
other hand, will always return `{Int & T}`
irrespectively of the bounds. Meaning, the two
intersectors differ in corner cases.
`lowerBoundIfFlexible` call in `isLiterallyTypeParameter` is backed by
the `equalityOfFlexibleTypeParameters` test.
^KT-35134 #fixed-in-k2
^KT-22499 #fixed-in-k2
^KT-46383 #fixed-in-k2
39 lines
888 B
Kotlin
Vendored
39 lines
888 B
Kotlin
Vendored
// LANGUAGE: +ReportErrorsForComparisonOperators
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fun nullableNothingIdentity(a: Int, b: Nothing?) {
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a === <!DEBUG_INFO_CONSTANT!>b<!>
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}
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fun samePrimitiveIdentity(a: Int, b: Int) {
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<!DEPRECATED_IDENTITY_EQUALS!>a === b<!>
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}
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fun identityWithImplicitBoxing(a: Int, b: Any?) {
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<!IMPLICIT_BOXING_IN_IDENTITY_EQUALS!>a === b<!>
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}
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enum class E1 { A, B }
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enum class E2 { C, D }
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fun nullableEnums(a: E1?, b: E2?) {
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a == b
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}
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fun <T> enumAsTypeParameterBound(a: T, b: Int) where T : Any, T : <!ONLY_ONE_CLASS_BOUND_ALLOWED!>E1<!> {
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<!EQUALITY_NOT_APPLICABLE!>a == b<!>
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}
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fun <T, K> twoTypeParameters(a: T, b: K) where T : Number, K : <!FINAL_UPPER_BOUND!>String<!> {
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a == b
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}
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interface I1
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interface I2
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enum class E3 : I1 { A, B }
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fun <A> compareTypeParameterWithEnum(a: A) where A: I1, A: I2 {
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<!INCOMPATIBLE_ENUM_COMPARISON_ERROR!>a == E1.A<!>
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a == E3.A
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}
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