checker: fix generic array method call with multi-types (#20237)

Author: yuyi98

vlib/v/checker/fn.v

@@ -1741,10 +1741,10 @@ fn (mut c Checker) method_call(mut node ast.CallExpr) ast.Type {
 	} else if (left_sym.kind == .map || final_left_sym.kind == .map)
 		&& method_name in ['clone', 'keys', 'values', 'move', 'delete'] {
 		if left_sym.kind == .map {
-			return c.map_builtin_method_call(mut node, unwrapped_left_type, c.table.sym(unwrapped_left_type))
+			return c.map_builtin_method_call(mut node, left_type)
 		} else if left_sym.info is ast.Alias {
-			parent_type := c.unwrap_generic(left_sym.info.parent_type)
-			return c.map_builtin_method_call(mut node, parent_type, c.table.final_sym(unwrapped_left_type))
+			parent_type := left_sym.info.parent_type
+			return c.map_builtin_method_call(mut node, parent_type)
 		}
 	} else if left_sym.kind == .array && method_name in ['insert', 'prepend'] {
 		if method_name == 'insert' {
@@ -2652,9 +2652,16 @@ fn (mut c Checker) check_map_and_filter(is_map bool, elem_typ ast.Type, node ast
 	}
 }
 
-fn (mut c Checker) map_builtin_method_call(mut node ast.CallExpr, left_type ast.Type, left_sym ast.TypeSymbol) ast.Type {
+fn (mut c Checker) map_builtin_method_call(mut node ast.CallExpr, left_type_ ast.Type) ast.Type {
 	method_name := node.name
 	mut ret_type := ast.void_type
+	// resolve T
+	left_type := if c.table.final_sym(left_type_).kind == .any {
+		c.unwrap_generic(left_type_)
+	} else {
+		left_type_
+	}
+	left_sym := c.table.final_sym(left_type)
 	match method_name {
 		'clone', 'move' {
 			if node.args.len != 0 {

vlib/v/tests/generics_array_method_call_with_multi_types_test.v

@@ -0,0 +1,44 @@
+pub type EventListener[T] = fn (T) !
+
+pub type Check[T] = fn (T) bool
+
+pub struct EventController[T] {
+mut:
+	id        int
+	listeners map[int]EventListener[T]
+}
+
+fn (mut ec EventController[T]) generate_id() int {
+	return ec.id++
+}
+
+@[params]
+pub struct EmitOptions {
+pub:
+	error_handler ?fn (int, IError)
+}
+
+pub fn (mut ec EventController[T]) emit(e T, options EmitOptions) {
+	if ec.listeners.len == 1 {
+		f := ec.listeners.values()[0]
+		f(e) or {
+			if g := options.error_handler {
+				g(0, err)
+			}
+		}
+		return
+	}
+}
+
+struct Foo {}
+
+struct Bar {}
+
+fn test_generic_array_method_call_with_multi_types() {
+	foo := EventController[Foo]{}
+	println(foo)
+	assert foo.id == 0
+	bar := EventController[Bar]{}
+	println(bar)
+	assert bar.id == 0
+}