Change behavior of equals/hashCode on adapted function references

Function references are now equal if they refer to the same function, and if the parameter/return type adaptation, which happens when a reference is used where some function type is expected, is exactly the same. This includes the number of expected positional parameters (which can be affected by defaults/varargs), whether the coercion of vararg parameter to Array type happened, and whether the coercion of return type to Unit happened. #KT-37543 Fixed
2020-03-16 22:26:46 +01:00
parent c344b85d4e
commit 3269a7e693
24 changed files with 942 additions and 22 deletions
@@ -0,0 +1,56 @@
+// IGNORE_BACKEND: JVM_IR, JS, JS_IR, NATIVE
+// IGNORE_BACKEND_FIR: JVM_IR
+// FILE: test.kt
+
+fun checkEqual(x: Any, y: Any) {
+    if (x != y || y != x) throw AssertionError("$x and $y should be equal")
+    if (x.hashCode() != y.hashCode()) throw AssertionError("$x and $y should have the same hash code")
+}
+
+fun checkNotEqual(x: Any, y: Any) {
+    if (x == y || y == x) throw AssertionError("$x and $y should NOT be equal")
+}
+
+class V {
+    fun target(): String = ""
+}
+
+private fun captureString(f: (V) -> String): Any = f
+private fun captureUnit(f: (V) -> Unit): Any = f
+
+private fun captureStringBound(f: () -> String): Any = f
+private fun captureUnitBound(f: () -> Unit): Any = f
+
+fun box(): String {
+    val v0 = V()
+    
+    checkEqual(captureString(V::target), captureString(V::target))
+    checkEqual(captureString(V::target), captureStringFromOtherFile())
+    checkEqual(captureUnit(V::target), captureUnit(V::target))
+    checkEqual(captureUnit(V::target), captureUnitFromOtherFile())
+
+    checkEqual(captureStringBound(v0::target), captureStringBound(v0::target))
+    checkEqual(captureStringBound(v0::target), captureStringBoundFromOtherFile(v0))
+    checkEqual(captureUnitBound(v0::target), captureUnitBound(v0::target))
+    checkEqual(captureUnitBound(v0::target), captureUnitBoundFromOtherFile(v0))
+
+
+    checkNotEqual(captureString(V::target), captureUnit(V::target))
+    checkNotEqual(captureStringBound(v0::target), captureUnitBound(v0::target))
+    checkNotEqual(captureString(V::target), captureUnitBoundFromOtherFile(v0))
+
+    return "OK"
+}
+
+// FILE: fromOtherFile.kt
+
+private fun captureString(f: (V) -> String): Any = f
+private fun captureUnit(f: (V) -> Unit): Any = f
+
+private fun captureStringBound(f: () -> String): Any = f
+private fun captureUnitBound(f: () -> Unit): Any = f
+
+fun captureStringFromOtherFile(): Any = captureString(V::target)
+fun captureUnitFromOtherFile(): Any = captureUnit(V::target)
+fun captureStringBoundFromOtherFile(v0: V): Any = captureStringBound(v0::target)
+fun captureUnitBoundFromOtherFile(v0: V): Any = captureUnitBound(v0::target)