Keywords

Keywords are reserved tokens starting with @ that perform specialized operations, such as returning from a function or assigning metadata.

Stable 4.0 uses keywords in four main roles:

• control flow: @return, @continue, @break
• block metadata: @weight, @on
• runtime attributes: @rep, @sep, @sel, @mut, @step, @total
• auto-hinting: @text

The attribute keywords are additive syntax over the runtime attribute system described in Attributes. The mutable attribute keywords can be read as plain expressions, accessed through angle-bracket syntax, or applied directly to an immediate block with @kw expr: { ... }.