diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 6b250d2778..d07b200168 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -56,6 +56,10 @@ fn (c mut Checker) resolve_expr_types(exprs []ast.Expr) {
 // update any types chich contain unresolved sub types
 fn (c &Checker) complete_types() {
 	for idx, t in c.table.types {
+		// skip builtin types
+		if idx <= table.map_type_idx {
+			continue
+		}
 		// println('Resolve type: $t.name')
 		if t.kind == .array {
 			mut info := t.array_info()
@@ -202,29 +206,25 @@ pub fn (c &Checker) check_method_call_expr(method_call_expr ast.MethodCallExpr)
 pub fn (c &Checker) selector_expr(selector_expr ast.SelectorExpr) table.TypeRef {
 	typ := c.expr(selector_expr.expr)
 	field_name := selector_expr.field
-	match typ.typ.kind {
-		.struct_ {
-			field := c.table.struct_find_field(typ.typ, field_name) or {
-				c.error('unknown field `${typ.typ.name}.$field_name`', selector_expr.pos)
-				exit(0)
+	if field := typ.typ.find_field(field_name) {
+		return field.typ
+	}
+	// types with parent struct (array/maps) handled here
+	if !isnil(typ.typ.parent) {
+		if field := typ.typ.parent.find_field(field_name) {
+			if field.typ.typ.kind == .unresolved {
+				return c.resolved[field.typ.idx]
 			}
 			return field.typ
 		}
-		else {
-			// types with parent struct (array/maps) handled here
-			if !isnil(typ.typ.parent) && typ.typ.parent.kind == .struct_ {
-				parent := typ.typ.parent
-				if field := c.table.struct_find_field(parent, field_name) {
-					if field.typ.typ.kind == .unresolved {
-						return c.resolved[field.typ.idx]
-					}
-					return field.typ
-				}
-			}
-			c.error('`$typ.typ.name` is not a struct', selector_expr.pos)
-		}
 	}
-	return c.table.type_ref(table.void_type_idx)
+	if typ.typ.kind != .struct_ {
+		c.error('`$typ.typ.name` is not a struct', selector_expr.pos)
+	}
+	else {
+		c.error('unknown field `${typ.typ.name}.$field_name`', selector_expr.pos)
+	}
+	exit(0)
 }
 
 // TODO: non deferred
diff --git a/vlib/v/parser/parse_type.v b/vlib/v/parser/parse_type.v
index 22b591ed86..073d8b6c2c 100644
--- a/vlib/v/parser/parse_type.v
+++ b/vlib/v/parser/parse_type.v
@@ -31,16 +31,18 @@ pub fn (p mut Parser) parse_array_ti(nr_muls int) table.TypeRef {
 }
 
 pub fn (p mut Parser) parse_map_type(nr_muls int) table.TypeRef {
-	if p.tok.kind != .lsbr {
-		// check notes in table/atypes.v near map_type_idx
-		return p.table.type_ref(p.table.type_idxs['map'])
-	}
 	p.next()
+	if p.tok.kind != .lsbr {
+		return p.table.type_ref(table.map_type_idx)
+	}
 	p.check(.lsbr)
-	key_ti := p.parse_type()
+	key_type := p.parse_type()
+	if key_type.typ.kind != .string {
+		p.error('maps can only have string keys for now')
+	}
 	p.check(.rsbr)
-	value_ti := p.parse_type()
-	idx := p.table.find_or_register_map(key_ti, value_ti)
+	value_type := p.parse_type()
+	idx := p.table.find_or_register_map(key_type, value_type)
 	return p.table.type_ref_ptr(idx, nr_muls)
 }
 
@@ -99,13 +101,14 @@ pub fn (p mut Parser) parse_type() table.TypeRef {
 			return p.parse_multi_return_ti()
 		}
 		else {
+			// no defer
+			if name == 'map' {
+				return p.parse_map_type(nr_muls)
+			}
 			defer {
 				p.next()
 			}
 			match name {
-				'map' {
-					return p.parse_map_type(nr_muls)
-				}
 				'voidptr' {
 					return p.table.type_ref_ptr(table.voidptr_type_idx, nr_muls)
 				}
diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index 60bdc33e24..1a78a364a9 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -458,14 +458,7 @@ pub fn (p mut Parser) name_expr() (ast.Expr,table.TypeRef) {
 		p.check(.dot)
 	}
 	if p.tok.lit == 'map' && p.peek_tok.kind == .lsbr {
-		p.next()
-		p.check(.lsbr)
-		key_type := p.check_name()
-		if key_type != 'string' {
-			p.error('maps can only have string keys for now')
-		}
-		p.check(.rsbr)
-		p.check_name()
+		map_type := p.parse_map_type(0)
 		return node,typ
 	}
 	// fn call or type cast
diff --git a/vlib/v/table/atypes.v b/vlib/v/table/atypes.v
index b32fb00a61..c8cb1ece04 100644
--- a/vlib/v/table/atypes.v
+++ b/vlib/v/table/atypes.v
@@ -23,6 +23,7 @@ pub:
 }
 
 pub const (
+	// primitive types
 	void_type_idx = 1
 	voidptr_type_idx = 2
 	charptr_type_idx = 3
@@ -36,15 +37,13 @@ pub const (
 	u64_type_idx = 11
 	f32_type_idx = 12
 	f64_type_idx = 13
-	string_type_idx = 14
-	char_type_idx = 15
-	byte_type_idx = 16
-	bool_type_idx = 17
-	// currently map is parsed from builtin as a normal struct named `map`
-	// any maps after that are of type map with parent being the struct named `map`
-	// same goes for array. this works since builtin is parsed first.
-	// will probably go back to registering these types manually and add idx here
-	// map_type_idx = 18
+	bool_type_idx = 14
+	// advanced / defined from v structs
+	string_type_idx = 15
+	char_type_idx = 16
+	byte_type_idx = 17
+	array_type_idx = 18
+	map_type_idx = 19
 )
 
 pub const (
@@ -102,7 +101,7 @@ pub fn(t &Type) array_info() Array {
 			return it
 		}
 		else {
-			panic('Type.mr_info(): no array info')
+			panic('Type.array_info(): no array info')
 		}
 	}
 }
@@ -114,7 +113,7 @@ pub fn(t &Type) array_fixed_info() ArrayFixed {
 			return it
 		}
 		else {
-			panic('Type.mr_info(): no array fixed info')
+			panic('Type.array_fixed(): no array fixed info')
 		}
 	}
 }
@@ -126,7 +125,7 @@ pub fn(t &Type) map_info() Map {
 			return it
 		}
 		else {
-			panic('Type.mr_info(): no map info')
+			panic('Type.map_info(): no map info')
 		}
 	}
 }
@@ -250,6 +249,11 @@ pub fn (t mut Table) register_builtin_types() {
 		kind: .f64
 		name: 'f64'
 	})
+	t.register_type(Type{
+		parent: 0
+		kind: .bool
+		name: 'bool'
+	})
 	t.register_type(Type{
 		parent: 0
 		kind: .string
@@ -267,13 +271,13 @@ pub fn (t mut Table) register_builtin_types() {
 	})
 	t.register_type(Type{
 		parent: 0
-		kind: .bool
-		name: 'bool'
+		kind: .array
+		name: 'array'
 	})
 	t.register_type(Type{
 		parent: 0
-		kind: .unresolved
-		name: 'unresolved'
+		kind: .map
+		name: 'map'
 	})
 }
 
diff --git a/vlib/v/table/table.v b/vlib/v/table/table.v
index dced4c754c..2260101aa5 100644
--- a/vlib/v/table/table.v
+++ b/vlib/v/table/table.v
@@ -202,6 +202,11 @@ pub fn (t &Table) register_method(typ &Type, new_fn Fn) bool {
 	return true
 }
 
+pub fn (t mut Table) new_tmp_var() string {
+	t.tmp_cnt++
+	return 'tmp$t.tmp_cnt'
+}
+
 pub fn (t &Type) has_method(name string) bool {
 	t.find_method(name) or {
 		return false
@@ -218,9 +223,26 @@ pub fn (t &Type) find_method(name string) ?Fn {
 	return none
 }
 
-pub fn (t mut Table) new_tmp_var() string {
-	t.tmp_cnt++
-	return 'tmp$t.tmp_cnt'
+
+pub fn (s &Type) has_field(name string) bool {
+	s.find_field(name) or {
+		return false
+	}
+	return true
+}
+
+pub fn (s &Type) find_field(name string) ?Field {
+	match s.info {
+		Struct {
+		    for field in it.fields {
+				if field.name == name {
+					return field
+				}
+			}
+		}
+		else {}
+	}
+	return none
 }
 
 pub fn (t &Table) struct_has_field(s &Type, name string) bool {
@@ -230,9 +252,6 @@ pub fn (t &Table) struct_has_field(s &Type, name string) bool {
 	else {
 		println('struct_has_field($s.name, $name) types.len=$t.types.len s.parent=none')
 	}
-	// for typ in t.types {
-	// println('$typ.idx $typ.name')
-	// }
 	if _ := t.struct_find_field(s, name) {
 		return true
 	}
@@ -246,21 +265,13 @@ pub fn (t &Table) struct_find_field(s &Type, name string) ?Field {
 	else {
 		println('struct_find_field($s.name, $name) types.len=$t.types.len s.parent=none')
 	}
-	info := s.info as Struct
-	for field in info.fields {
-		if field.name == name {
-			return field
-		}
+	if field := s.find_field(name) {
+		return field
 	}
 	if !isnil(s.parent) {
-		if s.parent.kind == .struct_ {
-			parent_info := s.parent.info as Struct
+		if field := s.parent.find_field(name) {
 			println('got parent $s.parent.name')
-			for field in parent_info.fields {
-				if field.name == name {
-					return field
-				}
-			}
+			return field
 		}
 	}
 	return none
@@ -287,7 +298,10 @@ pub fn (t &Table) find_type(name string) ?Type {
 pub fn (t mut Table) register_builtin_type(typ Type) int {
 	existing_idx := t.type_idxs[typ.name]
 	if existing_idx > 0 {
-		t.types[existing_idx] = typ
+		if existing_idx >= string_type_idx {
+			existing_type := t.types[existing_idx]
+			t.types[existing_idx] = { typ | kind: existing_type.kind }
+		}
 		return existing_idx
 	}
 	return t.register_type(typ)
@@ -339,7 +353,7 @@ pub fn (t mut Table) find_or_register_map(key_type TypeRef, value_type TypeRef)
 	}
 	// register
 	map_type := Type{
-		parent: &t.types[t.type_idxs['map']]
+		parent: &t.types[map_type_idx]
 		kind: .map
 		name: name
 		info: Map{
@@ -359,7 +373,7 @@ pub fn (t mut Table) find_or_register_array(elem_type TypeRef, nr_dims int) int
 	}
 	// register
 	array_type := Type{
-		parent: &t.types[t.type_idxs['array']]
+		parent: &t.types[array_type_idx]
 		kind: .array
 		name: name
 		info: Array{