Reserved Keywords

Note: Some of these words are reserved purely for backward compatibility.

If you need to use one of these names as binding and/or field name, see Use Illegal Identifier Names.

• and

• as

• assert

• await

• constraint

• else

• exception

• external

• false

• for

• if

• in

• include

• let

• module

• mutable

• of

• open

• private

• rec

• switch

• true

• try

• type

• when

• while

async, break, and continue are recognized in specific syntactic contexts, but can also be used as binding names. list and dict introduce literals when followed immediately by {; they can otherwise be used as names. lazy and with are not reserved.