KT-39532 Support intention to convert reference to lambda and vice versa for adapted references (#3495)

* Convert lambda to reference: support a function which has default parameters/unit return type/suspendability

#KT-39532 Fixed

idea/testData/intentions/convertLambdaToReference/defaultArgument.kt

@@ -1,4 +1,5 @@
 // IS_APPLICABLE: false
+// COMPILER_ARGUMENTS: -XXLanguage:-FunctionReferenceWithDefaultValueAsOtherType
 
 fun foo(z: Int, y: Int = 0) = y + z
 

idea/testData/intentions/convertLambdaToReference/defaultArgument2.kt

@@ -0,0 +1,5 @@
+// IS_APPLICABLE: false
+
+fun foo(z: Int, y: Int = 0) = y + z
+
+val x = { arg: Int <caret>-> foo(arg) }

idea/testData/intentions/convertLambdaToReference/defaultArgument3.kt

@@ -0,0 +1,7 @@
+fun foo(f: () -> Unit) {}
+
+fun bar(a: Int = 42) {}
+
+fun test() {
+    foo <caret>{ bar() }
+}

idea/testData/intentions/convertLambdaToReference/defaultArgument3.kt.after

@@ -0,0 +1,7 @@
+fun foo(f: () -> Unit) {}
+
+fun bar(a: Int = 42) {}
+
+fun test() {
+    foo(::bar)
+}

idea/testData/intentions/convertLambdaToReference/defaultArgument4.kt

@@ -0,0 +1,7 @@
+fun foo(f: (x: Int) -> Unit) {}
+
+fun bar(x: Int, y: Int = 42) {}
+
+fun test() {
+    foo <caret>{ bar(it) }
+}

idea/testData/intentions/convertLambdaToReference/defaultArgument4.kt.after

@@ -0,0 +1,7 @@
+fun foo(f: (x: Int) -> Unit) {}
+
+fun bar(x: Int, y: Int = 42) {}
+
+fun test() {
+    foo(::bar)
+}

idea/testData/intentions/convertLambdaToReference/defaultArgument5.kt

@@ -0,0 +1,7 @@
+fun Int.foo(x: Int, y: Int = 42) = x + y
+
+fun bar(f: (Int, Int) -> Int) {}
+
+fun test() {
+    bar <caret>{ i, x -> i.foo(x) }
+}

idea/testData/intentions/convertLambdaToReference/defaultArgument5.kt.after

@@ -0,0 +1,7 @@
+fun Int.foo(x: Int, y: Int = 42) = x + y
+
+fun bar(f: (Int, Int) -> Int) {}
+
+fun test() {
+    bar(Int::foo)
+}

idea/testData/intentions/convertLambdaToReference/suspendFunctionParameter.kt

@@ -1,4 +1,5 @@
 // IS_APPLICABLE: false
+// COMPILER_ARGUMENTS: -XXLanguage:-SuspendConversion
 
 fun coroutine(block: suspend () -> Unit) {}
 

idea/testData/intentions/convertLambdaToReference/suspendFunctionParameter3.kt

@@ -0,0 +1,8 @@
+// COMPILER_ARGUMENTS: -XXLanguage:+SuspendConversion
+fun foo(a: suspend () -> Unit) {}
+
+fun action() {}
+
+fun usage() {
+    foo { action() <caret> }
+}

idea/testData/intentions/convertLambdaToReference/suspendFunctionParameter3.kt.after

@@ -0,0 +1,8 @@
+// COMPILER_ARGUMENTS: -XXLanguage:+SuspendConversion
+fun foo(a: suspend () -> Unit) {}
+
+fun action() {}
+
+fun usage() {
+    foo(::action)
+}

idea/testData/intentions/convertLambdaToReference/unit.kt

@@ -1,4 +1,5 @@
 // IS_APPLICABLE: false
+// COMPILER_ARGUMENTS: -XXLanguage:-FunctionReferenceWithDefaultValueAsOtherType
 
 fun Int.exec(f: (Int) -> Unit) = f(this)
 

idea/testData/intentions/convertLambdaToReference/unit2.kt

@@ -0,0 +1,7 @@
+fun Int.exec(f: (Int) -> Unit) = f(this)
+
+fun bar(x: Int) = x
+
+fun foo() {
+    2.exec {<caret> bar(it) }
+}

idea/testData/intentions/convertLambdaToReference/unit2.kt.after

@@ -0,0 +1,7 @@
+fun Int.exec(f: (Int) -> Unit) = f(this)
+
+fun bar(x: Int) = x
+
+fun foo() {
+    2.exec(::bar)
+}