v2: parse builtin.v, cfns.v float.v

vlib/v/table/atypes.v

@@ -92,6 +92,11 @@ pub const (
 		name: 'bool'
 		idx: bool_type_idx
 	}
+	byte_type = Type{
+		kind: .byte
+		name: 'byte'
+		idx: byte_type_idx
+	}
 )
 /*
 pub fn (t Type) str() string {

vlib/v/table/table.v

@@ -251,6 +251,13 @@ pub fn (t mut Table) register_type(typ Type) int {
 	return idx
 }
 
+pub fn (t &Table) known_type(name string) bool {
+	_ = t.find_type(name) or {
+		return false
+	}
+	return true
+}
+
 pub fn (t mut Table) find_or_register_map(key_typ &Type, value_typ &Type) (int,string) {
 	name := 'map_${key_typ.name}_${value_typ.name}'
 	// existing