Nikolay Lunyak
86 lines
2.5 KiB
Kotlin
Vendored
86 lines
2.5 KiB
Kotlin
Vendored
// ISSUE: KT-56744
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// SKIP_TXT
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fun test() {
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var a: Any? = null
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var b = a
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var c = b
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// Now both `b` and `c` are aliases of `a`.
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if (a is String) {
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b.<!UNRESOLVED_REFERENCE!>length<!> // OK
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c.<!UNRESOLVED_REFERENCE!>length<!> // OK
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}
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if (b is String) {
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a.<!UNRESOLVED_REFERENCE!>length<!> // OK
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c.<!UNRESOLVED_REFERENCE!>length<!> // OK
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}
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if (c is String) {
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a.<!UNRESOLVED_REFERENCE!>length<!> // OK
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b.<!UNRESOLVED_REFERENCE!>length<!> // OK
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}
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b = 3 // break `b` -> `a`
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if (a is String) {
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b.<!UNRESOLVED_REFERENCE!>length<!> // error
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c.<!UNRESOLVED_REFERENCE!>length<!> // OK, since `c` is aliased to `a`
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}
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if (<!USELESS_IS_CHECK!>b is String<!>) {
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a.<!UNRESOLVED_REFERENCE!>length<!> // error
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c.<!UNRESOLVED_REFERENCE!>length<!> // error
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}
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if (c is String) {
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a.<!UNRESOLVED_REFERENCE!>length<!> // OK, since `c` is alised to `a`
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b.<!UNRESOLVED_REFERENCE!>length<!> // error
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}
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a = 2 // break `c` -> `a`
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if (<!USELESS_IS_CHECK!>a is String<!>) {
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b.<!UNRESOLVED_REFERENCE!>length<!> // error
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c.<!UNRESOLVED_REFERENCE!>length<!> // error
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}
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if (<!USELESS_IS_CHECK!>b is String<!>) {
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a.<!UNRESOLVED_REFERENCE!>length<!> // error
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c.<!UNRESOLVED_REFERENCE!>length<!> // error
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}
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if (c is String) {
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a.<!UNRESOLVED_REFERENCE!>length<!> // error
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b.<!UNRESOLVED_REFERENCE!>length<!> // error
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}
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c = b // create aliasing `c` -> `b`
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<!DEBUG_INFO_SMARTCAST!>c<!>.unaryPlus() // OK due to aliasing
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b = ""
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<!DEBUG_INFO_SMARTCAST!>c<!>.unaryPlus() // OK since `c` should carry all typing information that was on `b` before `b = ""`.
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c = ""
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<!DEBUG_INFO_SMARTCAST!>c<!>.length // OK
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c.<!UNRESOLVED_REFERENCE!>unaryPlus<!>() // error
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}
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fun test2() {
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var a: Any? = <!VARIABLE_WITH_REDUNDANT_INITIALIZER!>null<!>
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a = ""
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var b = a
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a = 3
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<!DEBUG_INFO_SMARTCAST!>b<!>.length // OK
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b.<!UNRESOLVED_REFERENCE!>unaryPlus<!>() // error
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}
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fun test3() {
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var a: Any? = null
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val b = a
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val c = a
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if (a is String) {
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<!DEBUG_INFO_SMARTCAST!>a<!>.length // ok
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b.<!UNRESOLVED_REFERENCE!>length<!> // ok
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c.<!UNRESOLVED_REFERENCE!>length<!> // ok
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}
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a = null // b and c are still aliases to the same old value
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if (b is String) {
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a.<!UNRESOLVED_REFERENCE!>length<!> // error
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<!DEBUG_INFO_SMARTCAST!>b<!>.length // ok
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c.<!UNRESOLVED_REFERENCE!>length<!> // ok
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}
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}
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