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FIR: assume a lambda returns Unit if it ends with a non-expression

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While it is theoretically useful to know that `{ while(true) {} }`
returns Nothing, CFG node deadness is not precise enough to do that: if
the entire lambda is dead, it's no longer possible to find out whether
the loop is terminating. Besides, `while (true)` and `if (true)` are
pretty much the only constructs like that anyway.

Note that this commit does not affect resolution for lambdas that end in
a Nothing-returning expression, e.g. `throw`.
This commit is contained in:
pyos
2022-12-09 22:11:44 +01:00
committed by Dmitriy Novozhilov
parent 803abfeba8
commit 1eccb9aea1
12 changed files with 47 additions and 42 deletions
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compiler/tests-spec/testData/diagnostics/notLinked/dfa/pos/51.fir.kt
Vendored
+4 -4
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@@ -170,8 +170,8 @@ fun case_15(z: Any?) {
return@let it as Int
while (true) { println(1) }
}
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int")!>y<!>
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int")!>y<!>.equals(10)
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any")!>y<!>
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any")!>y<!>.equals(10)
}
/*
@@ -183,8 +183,8 @@ fun case_16(z: Any?) {
return@run this as Int
while (true) { println(1) }
}
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int")!>y<!>
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Int")!>y<!>.equals(10)
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any")!>y<!>
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any")!>y<!>.equals(10)
}
/*