FIR: Support exhaustive whens on subjects of intersection type

2021-06-08 17:59:01 +03:00
parent c8b9a3a6f0
commit 2653565f56
11 changed files with 262 additions and 11 deletions
@@ -0,0 +1,42 @@
+// !CHECK_TYPE
+
+sealed class A {
+    class A1 : A()
+    class A2 : A()
+}
+
+sealed class B {
+    class B1 : B()
+    class B2 : B()
+}
+
+fun foo(a: A) {
+    if (a !is B) return
+
+    <!NO_ELSE_IN_WHEN!>when<!> (<!DEBUG_INFO_SMARTCAST!>a<!>) {
+        is A.A1 -> ""
+        is A.A2 -> "v"
+    }.length
+
+    <!NO_ELSE_IN_WHEN!>when<!> (<!DEBUG_INFO_SMARTCAST!>a<!>) {
+        is A.A1 -> ""
+        is A.A2 -> "v"
+    }.length // OK
+
+    <!NO_ELSE_IN_WHEN!>when<!> (<!DEBUG_INFO_SMARTCAST!>a<!>) {
+        is A.A1 -> ""
+        is A.A2 -> "v"
+        is <!INCOMPATIBLE_TYPES!>B.B1<!> -> "..." // should be warning: unreachable code
+    }.length // OK
+
+    <!NO_ELSE_IN_WHEN!>when<!> (<!DEBUG_INFO_SMARTCAST!>a<!>) {
+        is A.A1 -> ""
+        is <!INCOMPATIBLE_TYPES!>B.B1<!> -> "..."
+        is A.A2 -> "v"
+    }.length // OK
+
+    <!NO_ELSE_IN_WHEN!>when<!> (<!DEBUG_INFO_SMARTCAST!>a<!>) {
+        is A.A1 -> ""
+        is <!INCOMPATIBLE_TYPES!>B.B1<!> -> "..."
+    }.length
+}