Fixed function expression recovery

compiler/testData/psi/FunctionExpressions_ERR.kt

@@ -0,0 +1,35 @@
+val a = fun )
+val a = fun foo)
+
+val a = fun [a] T.foo(a : ) : bar
+
+val a = fun [a()] T.foo<>(a : foo) : bar
+val a = fun [a()] T.<>(a : foo) : bar
+
+val a = fun T.foo<T, , T>(a : foo) : bar
+val a = fun T.foo<, T, , T>(a : foo) : bar
+val a = fun T.foo<T, T>(, a : foo, , a: b) : bar
+
+val a = fun foo() : = a;
+
+val public_fun = public fun ()
+val open_fun = open fun ()
+val final_fun = final fun ()
+
+val where_fun = fun () where T: V
+fun where_fun() = fun () where T: V
+
+fun outer() {
+    bar(fun )
+
+    bar(fun T)
+    bar(fun T.)
+    bar(fun [a])
+
+
+    bar(public fun ())
+    bar(open fun ())
+    bar(final fun ())
+
+    bar(fun () where T: V)
+}