[NI] Soften restictions on using Nothing as proper constraint for full call completion

Consider lower `Nothing` constraint non-proper only if there is a dependant not analyzed postponed atom. Early completion to `Nothing` provides data flow info for smart casts. KT-35668 Fixed
2020-01-22 15:46:33 +03:00
parent f1d9177112
commit 78c9bbcc0d
13 changed files with 234 additions and 24 deletions
@@ -0,0 +1,52 @@
+// !LANGUAGE: +NewInference
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+fun <K> id(it: K) = it
+
+fun <E> smartCast(arg: E?, fn: () -> Any?): E = TODO()
+fun <E1> noSmartCast1(arg: E1?, fn: () -> E1): E1 = TODO()
+fun <E2> noSmartCast2(arg: E2?, fn: E2): E2 = TODO()
+fun <E3, F : E3> noSmartCast3(arg: E3?, fn: () -> F): E3 = TODO()
+fun <E4, F : E4> noSmartCast4(arg: E4?, fn: F): E4 = TODO()
+
+
+fun testSmartCast(s: String?) {
+    id(
+        if (s != null) ""
+        else <!IMPLICIT_NOTHING_AS_TYPE_PARAMETER!>smartCast<!>(null) { "" }
+    )
+    <!DEBUG_INFO_SMARTCAST!>s<!>.length
+}
+
+fun testNoSmartCast1(s: String?) {
+    id(
+        if (s != null) ""
+        else noSmartCast1(null) { "" }
+    )
+    s<!UNSAFE_CALL!>.<!>length
+}
+
+fun testNoSmartCast2(s: String?) {
+    id(
+        if (s != null) ( {""} )
+        else noSmartCast2(null) { "" }
+    )
+    s<!UNSAFE_CALL!>.<!>length
+}
+
+fun testNoSmartCast3(s: String?) {
+    id(
+        if (s != null) ""
+        else noSmartCast3(null) { "" }
+    )
+    s<!UNSAFE_CALL!>.<!>length
+}
+
+// KT-36069
+fun testNoSmartCast4(s: String?) {
+    id(
+        if (s != null) ( {""} )
+        else <!IMPLICIT_NOTHING_AS_TYPE_PARAMETER, IMPLICIT_NOTHING_AS_TYPE_PARAMETER!>noSmartCast4<!>(null) <!TYPE_MISMATCH!>{ <!TYPE_MISMATCH!>""<!> }<!>
+    )
+    s<!UNSAFE_CALL!>.<!>length
+}