all: `!is` operator

vlib/v/checker/checker.v

@@ -546,7 +546,7 @@ pub fn (mut c Checker) infix_expr(mut infix_expr ast.InfixExpr) table.Type {
 		.right_shift {
 			return c.check_shift(left_type, right_type, left_pos, right_pos)
 		}
-		.key_is {
+		.key_is, .not_is {
 			type_expr := infix_expr.right as ast.Type
 			typ_sym := c.table.get_type_symbol(type_expr.typ)
 			if typ_sym.kind == .placeholder {

vlib/v/doc/doc.v

@@ -222,7 +222,8 @@ pub fn (mut d Doc) generate() ?bool {
 		for si, stmt in stmts {
 			if stmt is ast.Comment { continue }
 
-			if !(stmt is ast.Module) {
+			//if !(stmt is ast.Module) {
+			if stmt !is ast.Module {
 				// todo: accumulate consts
 				mut name := d.get_name(stmt)
 				signature := d.get_signature(stmt)

vlib/v/gen/cgen.v

@@ -1744,7 +1744,7 @@ fn (mut g Gen) infix_expr(node ast.InfixExpr) {
 	// g.infix_op = node.op
 	left_type := if node.left_type == table.t_type { g.cur_generic_type } else { node.left_type }
 	left_sym := g.table.get_type_symbol(left_type)
-	if node.op == .key_is {
+	if node.op in [.key_is, .not_is] {
 		g.is_expr(node)
 		return
 	}
@@ -3767,6 +3767,7 @@ fn (mut g Gen) as_cast(node ast.AsCast) {
 }
 
 fn (mut g Gen) is_expr(node ast.InfixExpr) {
+	eq := if node.op == .key_is { '==' } else { '!=' }
 	g.expr(node.left)
 	if node.left_type.is_ptr() {
 		g.write('->')
@@ -3775,14 +3776,14 @@ fn (mut g Gen) is_expr(node ast.InfixExpr) {
 	}
 	sym := g.table.get_type_symbol(node.left_type)
 	if sym.kind == .interface_ {
-		g.write('_interface_idx == ')
+		g.write('_interface_idx $eq ')
 		// `_Animal_Dog_index`
 		sub_type := node.right as ast.Type
 		sub_sym := g.table.get_type_symbol(sub_type.typ)
 		g.write('_${sym.name}_${sub_sym.name}_index')
 		return
 	} else if sym.kind == .sum_type {
-		g.write('typ == ')
+		g.write('typ $eq ')
 	}
 	g.expr(node.right)
 }

vlib/v/parser/pratt.v

@@ -198,7 +198,7 @@ fn (mut p Parser) infix_expr(left ast.Expr) ast.Expr {
 	pos := p.tok.position()
 	p.next()
 	mut right := ast.Expr{}
-	if op == .key_is {
+	if op in [.key_is, .not_is] {
 		p.expecting_type = true
 	}
 	right = p.expr(precedence)

vlib/v/scanner/scanner.v

@@ -946,6 +946,11 @@ pub fn (mut s Scanner) scan() token.Token {
 				s.pos += 2
 				return s.new_token(.not_in, '', 3)
 			}
+			else if nextc == `i` && s.text[s.pos+2] == `s` && s.text[s.pos+3].is_space() {
+				s.pos += 2
+				return s.new_token(.not_is, '', 3)
+			}
+			//
 			else {
 				return s.new_token(.not, '', 1)
 			}

vlib/v/tests/sum_type_test.v

@@ -11,6 +11,7 @@ struct IntegerLiteral {
 fn handle(e Expr) string {
 	is_literal := e is IntegerLiteral
 	assert is_literal
+	assert !(e !is IntegerLiteral)
 	if e is IntegerLiteral {
 		println('int')
 	}
@@ -39,8 +40,8 @@ fn test_assignment_and_push() {
 	mut expr1 := Expr{}
 	mut arr1 := []Expr{}
 	expr := IntegerLiteral{
-        val: '111'
+		val: '111'
-    }
+	}
 	arr1 << expr
 	match arr1[0] {
 		IntegerLiteral {
@@ -54,24 +55,33 @@ fn test_assignment_and_push() {
 }
 
 // Test moving structs between master/sub arrays
-
 type Master = Sub1 | Sub2
+
 struct Sub1 {
 mut:
-	val int
+	val  int
 	name string
 }
+
 struct Sub2 {
 	name string
-	val int
+	val  int
 }
 
 fn test_converting_down() {
 	mut out := []Master{}
-	out << Sub1 { val: 1, name: 'one' }
+	out << Sub1{
-	out << Sub2 { val: 2, name: 'two'}
+		val: 1
-	out << Sub2 { val: 3, name: 'three'}
+		name: 'one'
-
+	}
+	out << Sub2{
+		val: 2
+		name: 'two'
+	}
+	out << Sub2{
+		val: 3
+		name: 'three'
+	}
 	mut res := []Sub2{cap: out.len}
 	for d in out {
 		match d {
@@ -79,10 +89,8 @@ fn test_converting_down() {
 			else {}
 		}
 	}
-
 	assert res[0].val == 2
 	assert res[0].name == 'two'
 	assert res[1].val == 3
 	assert res[1].name == 'three'
 }
-

vlib/v/token/token.v

@@ -45,6 +45,7 @@ pub enum Kind {
 	left_shift
 	right_shift
 	not_in // !in
+	not_is // !is
 	// at // @
 	assign // =
 	decl_assign // :=
@@ -169,6 +170,7 @@ fn build_token_str() []string {
 	s[Kind.ellipsis] = '...'
 	s[Kind.comma] = ','
 	s[Kind.not_in] = '!in'
+	s[Kind.not_is] = '!is'
 	// s[Kind.at] = '@'
 	s[Kind.semicolon] = ';'
 	s[Kind.colon] = ':'
@@ -382,7 +384,7 @@ pub fn (tok Token) precedence() int {
 		.left_shift_assign, .right_shift_assign, .mult_assign, .xor_assign {
 			return int(Precedence.assign)
 		}
-		.key_in, .not_in, .key_as, .key_is {
+		.key_in, .not_in, .key_as, .key_is, .not_is {
 			return int(Precedence.in_as)
 		}
 		.logical_or, .and {
@@ -422,7 +424,7 @@ pub fn (k Kind) is_start_of_type() bool {
 pub fn (kind Kind) is_infix() bool {
 	return kind in [.plus, .minus, .mod, .mul, .div, .eq, .ne, .gt, .lt, .key_in,
 	//
-	.key_as, .ge, .le, .logical_or, .xor, .not_in, .key_is,
+	.key_as, .ge, .le, .logical_or, .xor, .not_in, .key_is, .not_is,
 	//
 	.and, .dot, .pipe, .amp, .left_shift, .right_shift]
 }