diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index 85b4712fe7..f0361374ec 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -435,9 +435,6 @@ pub fn (mut p Parser) top_stmt() ast.Stmt {
 					.key_type {
 						return p.type_decl()
 					}
-					.key___type {
-						return p.union_sum_type_decl()
-					}
 					else {
 						p.error('wrong pub keyword usage')
 						return ast.Stmt{}
@@ -480,9 +477,6 @@ pub fn (mut p Parser) top_stmt() ast.Stmt {
 			.key_type {
 				return p.type_decl()
 			}
-			.key___type {
-				return p.union_sum_type_decl()
-			}
 			.key_enum {
 				return p.enum_decl()
 			}
@@ -1902,58 +1896,6 @@ $pubfn (mut e  $enum_name) toggle(flag $enum_name)   { unsafe{ *e = int(*e) ^  (
 	}
 }
 
-fn (mut p Parser) union_sum_type_decl() ast.TypeDecl {
-	start_pos := p.tok.position()
-	is_pub := p.tok.kind == .key_pub
-	if is_pub {
-		p.next()
-	}
-	p.check(.key___type)
-	end_pos := p.tok.position()
-	decl_pos := start_pos.extend(end_pos)
-	name := p.check_name()
-	if name.len == 1 && name[0].is_capital() {
-		p.error_with_pos('single letter capital names are reserved for generic template types.',
-			decl_pos)
-	}
-	p.check(.assign)
-	mut sum_variants := []table.Type{}
-	first_type := p.parse_type() // need to parse the first type before we can check if it's `type A = X | Y`
-	if p.tok.kind == .pipe {
-		p.next()
-		sum_variants << first_type
-		// type SumType = A | B | c
-		for {
-			variant_type := p.parse_type()
-			sum_variants << variant_type
-			if p.tok.kind != .pipe {
-				break
-			}
-			p.check(.pipe)
-		}
-		prepend_mod_name := p.prepend_mod(name)
-		p.table.register_type_symbol(table.TypeSymbol{
-			kind: .sum_type
-			name: prepend_mod_name
-			source_name: prepend_mod_name
-			mod: p.mod
-			info: table.SumType{
-				variants: sum_variants
-			}
-			is_public: is_pub
-		})
-		return ast.SumTypeDecl{
-			name: name
-			is_pub: is_pub
-			sub_types: sum_variants
-			pos: decl_pos
-		}
-	}
-	// just for this implementation
-	p.error_with_pos('wrong union sum type declaration', decl_pos)
-	return ast.TypeDecl{}
-}
-
 fn (mut p Parser) type_decl() ast.TypeDecl {
 	start_pos := p.tok.position()
 	is_pub := p.tok.kind == .key_pub
diff --git a/vlib/v/token/token.v b/vlib/v/token/token.v
index 3fc57718e2..02d5ab8c54 100644
--- a/vlib/v/token/token.v
+++ b/vlib/v/token/token.v
@@ -121,7 +121,6 @@ pub enum Kind {
 	key_struct
 	key_true
 	key_type
-	key___type // type
 	key_typeof
 	key_orelse
 	key_union
@@ -265,7 +264,6 @@ fn build_token_str() []string {
 	s[Kind.key_lock] = 'lock'
 	s[Kind.key_rlock] = 'rlock'
 	s[Kind.key_type] = 'type'
-	s[Kind.key___type] = '__type'
 	s[Kind.key_for] = 'for'
 	s[Kind.key_fn] = 'fn'
 	s[Kind.key_true] = 'true'