FIR/FE1.0: keep flexibility when approximating local types

compiler/testData/diagnostics/tests/inference/substitutions/hideFlexibleLocalTypeInPublicPosition.kt

@@ -0,0 +1,24 @@
+// FIR_IDENTICAL
+// ISSUE: KT-30054
+// !LANGUAGE: +KeepNullabilityWhenApproximatingLocalType
+// FILE: J.java
+public class J {
+    public static <T> T flexibleId(T x) { return x; }
+}
+
+// FILE: main.kt
+interface I {
+    fun foo(): String
+}
+
+fun bar(condition: Boolean) /*: I! */ =
+    J.flexibleId(object : I {
+        override fun foo() = "may or may not check for null first"
+        fun baz() = "invisible"
+    })
+
+fun main() {
+    bar(false).<!UNRESOLVED_REFERENCE!>baz<!>()
+    bar(false).foo()
+    bar(false)?.foo()
+}

compiler/testData/diagnostics/tests/inference/substitutions/hideFlexibleLocalTypeInPublicPosition.txt

@@ -0,0 +1,21 @@
+package
+
+public fun bar(/*0*/ condition: kotlin.Boolean): I!
+public fun main(): kotlin.Unit
+
+public interface I {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public open class J {
+    public constructor J()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    // Static members
+    public open fun </*0*/ T : kotlin.Any!> flexibleId(/*0*/ x: T!): T!
+}

compiler/testData/diagnostics/tests/inference/substitutions/hideFlexibleLocalTypeInPublicPosition_before.fir.kt

@@ -0,0 +1,23 @@
+// ISSUE: KT-30054
+// !LANGUAGE: -KeepNullabilityWhenApproximatingLocalType
+// FILE: J.java
+public class J {
+    public static <T> T flexibleId(T x) { return x; }
+}
+
+// FILE: main.kt
+interface I {
+    fun foo(): String
+}
+
+fun bar(condition: Boolean) /*: I! */ =
+    J.flexibleId(object : I {
+        override fun foo() = "may or may not check for null first"
+        fun baz() = "invisible"
+    })
+
+fun main() {
+    bar(false).<!UNRESOLVED_REFERENCE!>baz<!>()
+    bar(false).foo()
+    bar(false)?.foo()
+}

compiler/testData/diagnostics/tests/inference/substitutions/hideFlexibleLocalTypeInPublicPosition_before.kt

@@ -0,0 +1,23 @@
+// ISSUE: KT-30054
+// !LANGUAGE: -KeepNullabilityWhenApproximatingLocalType
+// FILE: J.java
+public class J {
+    public static <T> T flexibleId(T x) { return x; }
+}
+
+// FILE: main.kt
+interface I {
+    fun foo(): String
+}
+
+<!APPROXIMATED_LOCAL_TYPE_WILL_BECOME_FLEXIBLE!>fun bar(condition: Boolean)<!> /*: I! */ =
+    J.flexibleId(object : I {
+        override fun foo() = "may or may not check for null first"
+        fun baz() = "invisible"
+    })
+
+fun main() {
+    bar(false).<!UNRESOLVED_REFERENCE!>baz<!>()
+    bar(false).foo()
+    bar(false)<!UNNECESSARY_SAFE_CALL!>?.<!>foo()
+}

compiler/testData/diagnostics/tests/inference/substitutions/hideFlexibleLocalTypeInPublicPosition_before.txt

@@ -0,0 +1,21 @@
+package
+
+public fun bar(/*0*/ condition: kotlin.Boolean): I
+public fun main(): kotlin.Unit
+
+public interface I {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public open class J {
+    public constructor J()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    // Static members
+    public open fun </*0*/ T : kotlin.Any!> flexibleId(/*0*/ x: T!): T!
+}

compiler/testData/diagnostics/tests/inference/substitutions/hideNullableLocalTypeInPublicPosition_before.fir.kt

@@ -1,4 +1,5 @@
 // ISSUE: KT-30054
+// !LANGUAGE: -KeepNullabilityWhenApproximatingLocalType
 interface I {
     fun foo(): String
 }

compiler/testData/diagnostics/tests/inference/substitutions/hideNullableLocalTypeInPublicPosition_before.kt

@@ -1,4 +1,5 @@
 // ISSUE: KT-30054
+// !LANGUAGE: -KeepNullabilityWhenApproximatingLocalType
 interface I {
     fun foo(): String
 }