Disappear - grammarware/slps GitHub Wiki
This operator behaves like project, but only allows for nillable elements (optional, star) to disappear.
disappear:
marked-production
Given the input:
foo:
bar wez* qux
After using this transformation:
disappear(
foo:
bar <wez*> qux
);
The result will look like this:
foo:
bar qux
- Disappear is a part of XBGF