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[FE 1.0] Report USELESS_IS_CHECK if is expression is always false

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^KT-47684 Fixed
This commit is contained in:
Dmitriy Novozhilov
2021-07-09 14:03:48 +03:00
committed by teamcityserver
parent 785e2f862c
commit 7b5a5f5682
24 changed files with 283 additions and 59 deletions
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compiler/testData/diagnostics/testsWithStdLib/contracts/smartcasts/deeplyNested.kt
Vendored
+2 -2
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@@ -78,7 +78,7 @@ fun branchedAndNested(x: Any?, y: Any?) {
fun br(y: Any?) {
if (myAssert(y is Int) == Unit && myAssert(y is String) == Unit) {
if (myAssert(y is Int) == Unit && myAssert(<!USELESS_IS_CHECK!>y is String<!>) == Unit) {
<!DEBUG_INFO_SMARTCAST!>y<!>.length
<!DEBUG_INFO_SMARTCAST!>y<!>.inc()
}
@@ -89,7 +89,7 @@ fun branchedAndNestedWithNativeOperators(x: Any?, y: Any?) {
equalsTrue(notEqualsNull(nullWhenNotString(x))) // x is String
&&
(
(myAssert(y is Int) == Unit && myAssert(y is String) == Unit) // y is Int, String
(myAssert(y is Int) == Unit && myAssert(<!USELESS_IS_CHECK!>y is String<!>) == Unit) // y is Int, String
||
equalsTrue(isInt(y) && isString(y)) // y is Int, String
)