for loops

compiler/lexer/lexer.odin

@@ -27,6 +27,7 @@ keyword_kind :: proc(text: string) -> token.Kind {
 	case "or":            return .Keyword_Or
 	case "if":            return .Keyword_If
 	case "while":         return .Keyword_While
+	case "for":           return .Keyword_For
 	case "else":          return .Keyword_Else
 	case "true":          return .Keyword_True
 	case "false":         return .Keyword_False
@@ -162,6 +163,9 @@ lex :: proc(
 				if cursor < len(bytes) && bytes[cursor] == '.' {
 					cursor += 1
 					append_token(&stream, source_file, .Ellipsis, start, cursor)
+				} else if cursor < len(bytes) && bytes[cursor] == '=' {
+					cursor += 1
+					append_token(&stream, source_file, .Range_Inclusive, start, cursor)
 				} else {
 					append_token(&stream, source_file, .Range, start, cursor)
 				}