parser/cgen: interface <<; `any` type

vlib/v/checker/checker.v

@@ -391,7 +391,7 @@ pub fn (mut c Checker) infix_expr(infix_expr mut ast.InfixExpr) table.Type {
 				// `array << elm`
 				c.fail_if_immutable(infix_expr.left)
 				// the expressions have different types (array_x and x)
-				if c.table.check(c.table.value_type(left_type), right_type) {
+				if c.table.check(right_type, c.table.value_type(left_type)) { // , right_type) {
 					// []T << T
 					return table.void_type
 				}
@@ -400,7 +400,7 @@ pub fn (mut c Checker) infix_expr(infix_expr mut ast.InfixExpr) table.Type {
 					return table.void_type
 				}
 				s := left.name.replace('array_', '[]')
-				c.error('cannot append `$right.name` to `$s', infix_expr.right.position())
+				c.error('cannot append `$right.name` to `$s`', infix_expr.right.position())
 				return table.void_type
 			} else if !left.is_int() {
 				c.error('cannot shift type $right.name into non-integer type $left.name', infix_expr.left.position())

vlib/v/gen/cgen.v

@@ -1470,7 +1470,14 @@ fn (mut g Gen) infix_expr(node ast.InfixExpr) {
 			g.write('array_push(&')
 			g.expr(node.left)
 			g.write(', &($elem_type_str[]){ ')
+			elem_sym := g.table.get_type_symbol(info.elem_type)
+			if elem_sym.kind == .interface_ {
+				g.interface_call(node.right_type, info.elem_type)
+			}
 			g.expr_with_cast(node.right, node.right_type, info.elem_type)
+			if elem_sym.kind == .interface_ {
+				g.write(')')
+			}
 			g.write(' })')
 		}
 	} else if (node.left_type == node.right_type) && node.left_type.is_float() && node.op in

vlib/v/table/atypes.v

@@ -176,6 +176,7 @@ pub const (
 	ustring_type_idx = 19
 	array_type_idx   = 20
 	map_type_idx     = 21
+	any_type_idx     = 22
 )
 
 pub const (
@@ -220,6 +221,7 @@ pub const (
 	ustring_type = new_type(ustring_type_idx)
 	array_type   = new_type(array_type_idx)
 	map_type     = new_type(map_type_idx)
+	any_type     = new_type(any_type_idx)
 )
 
 pub const (
@@ -227,7 +229,7 @@ pub const (
 		'u16',
 		'u32',
 		'u64', 'f32', 'f64', 'string', 'ustring', 'char', 'byte', 'bool', 'none', 'array', 'array_fixed',
-		'map', 'struct',
+		'map', 'any', 'struct',
 		'mapnode', 'size_t']
 )
 
@@ -270,6 +272,7 @@ pub enum Kind {
 	array
 	array_fixed
 	map
+	any
 	struct_
 	multi_return
 	sum_type
@@ -427,6 +430,10 @@ pub fn (mut t Table) register_builtin_type_symbols() {
 		kind: .map
 		name: 'map'
 	})
+	t.register_type_symbol(TypeSymbol{
+		kind: .any
+		name: 'any'
+	})
 	t.register_type_symbol(TypeSymbol{
 		kind: .size_t
 		name: 'size_t'
@@ -466,6 +473,7 @@ pub fn (t &TypeSymbol) is_number() bool {
 	return t.is_int() || t.is_float()
 }
 
+// for debugging/errors only, perf is not an issue
 pub fn (k Kind) str() string {
 	k_str := match k {
 		.placeholder { 'placeholder' }
@@ -496,6 +504,7 @@ pub fn (k Kind) str() string {
 		.sum_type { 'sum_type' }
 		.alias { 'alias' }
 		.enum_ { 'enum' }
+		.any { 'any' }
 		else { 'unknown' }
 	}
 	return k_str

vlib/v/table/table.v

@@ -469,6 +469,9 @@ pub fn (t &Table) check(got, expected Type) bool {
 	if exp_idx == voidptr_type_idx || got_idx == voidptr_type_idx {
 		return true
 	}
+	if exp_idx == any_type_idx || got_idx == any_type_idx {
+		return true
+	}
 	if (exp_idx in pointer_type_idxs || exp_idx in number_type_idxs) && (got_idx in pointer_type_idxs ||
 		got_idx in number_type_idxs) {
 		return true
@@ -485,7 +488,7 @@ pub fn (t &Table) check(got, expected Type) bool {
 	// # NOTE: use symbols from this point on for perf
 	got_type_sym := t.get_type_symbol(got)
 	exp_type_sym := t.get_type_symbol(expected)
-	//
+	// Handle expected interface
 	if exp_type_sym.kind == .interface_ {
 		mut info := exp_type_sym.info as Interface
 		// println('gen_types before')
@@ -498,6 +501,13 @@ pub fn (t &Table) check(got, expected Type) bool {
 		// println(info.gen_types)
 		return true
 	}
+	// Handle expected interface array
+	/*
+	if exp_type_sym.kind == .array && t.get_type_symbol(t.value_type(exp_idx)).kind == .interface_ {
+		return true
+	}
+	*/
+	//
 	if exp_type_sym.kind == .function && got_type_sym.kind == .int {
 		// TODO temporary
 		// fn == 0

vlib/v/tests/interface_test.v

@@ -91,3 +91,11 @@ interface Speaker {
 	speak()
 }
 
+
+fn test_interface_array() {
+	mut animals := []Speaker{}
+	animals = [ Cat{}, Dog{} ]
+	animals << Cat{}
+	assert true
+	assert animals.len == 3
+}