The following table lists the words that the Dart language treats specially.
Avoid using these words as identifiers. However, if necessary, the keywords marked with superscripts can be identifiers:
Words with the superscript 1 are contextual keywords, which have meaning only in specific places. They're valid identifiers everywhere.
Words with the superscript 2 are built-in identifiers. These keywords are valid identifiers in most places, but they can't be used as class or type names, or as import prefixes.
Words with the superscript 3 are limited reserved words related to asynchrony support. You can't use
yieldas an identifier in any function body marked with
All other words in the table are reserved words, which can't be identifiers.