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[FIR] Do not terminate smartcast CFG nodes when result is Nothing

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Terminating a CFG node because the result is Nothing should be reserved
for explicit Nothing type definitions, and not apply when smartcasting.
This allows boolean expressions to propagate implications correctly even
when the RHS is impossible or will never be executed.

^KT-47931 Fixed
This commit is contained in:
Brian Norman
2023-11-14 10:21:38 -06:00
committed by Space Team
parent e92fab65aa
commit a4b3b08e59
6 changed files with 298 additions and 309 deletions
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compiler/tests-spec/testData/diagnostics/notLinked/dfa/pos/4.fir.kt
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+1 -1
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@@ -78,7 +78,7 @@ fun case_7() {
// TESTCASE NUMBER: 8
fun case_8(x: TypealiasString) {
if (<!SENSELESS_COMPARISON!>x == null<!> && <!SENSELESS_COMPARISON!><!DEBUG_INFO_EXPRESSION_TYPE("TypealiasString & kotlin.Nothing")!>x<!> == null<!>) <!DEBUG_INFO_EXPRESSION_TYPE("TypealiasString")!>x<!>
if (<!SENSELESS_COMPARISON!>x == null<!> && <!SENSELESS_COMPARISON!><!DEBUG_INFO_EXPRESSION_TYPE("TypealiasString & kotlin.Nothing")!>x<!> == null<!>) <!DEBUG_INFO_EXPRESSION_TYPE("TypealiasString & kotlin.Nothing")!>x<!>
}
// TESTCASE NUMBER: 9