Frontend support for function as expression

compiler/testData/diagnostics/tests/functionAsExpression/WithGenericParameters.kt

@@ -0,0 +1,18 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+trait A
+fun devNull(a: Any?){}
+
+val generic_fun = fun<!TYPE_PARAMETERS_NOT_ALLOWED!><T><!>(t: T): T = null!!
+val extension_generic_fun = fun<!TYPE_PARAMETERS_NOT_ALLOWED!><T><!><!UNRESOLVED_REFERENCE!>T<!>.(t: T): T = null!!
+
+fun fun_with_where() = fun <!TYPE_PARAMETERS_NOT_ALLOWED!><T><!> <!UNRESOLVED_REFERENCE!>T<!>.(t: T): T where T: A {<!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>
+
+
+fun outer() {
+    devNull(fun <!TYPE_PARAMETERS_NOT_ALLOWED!><T><!>() {})
+    devNull(fun <!TYPE_PARAMETERS_NOT_ALLOWED!><T><!> T.name() {})
+    devNull(fun <!TYPE_PARAMETERS_NOT_ALLOWED!><T><!> name(): T = null!!)
+    devNull(fun <!TYPE_PARAMETERS_NOT_ALLOWED!><T><!> name(t: T) {})
+    devNull(fun <!TYPE_PARAMETERS_NOT_ALLOWED!><T><!> name() where T:A {})
+}