FORBID_INCREASE_INDENT

When compiling indentation-sensitive languages, this message part matches whitespace that does not increase the indentation beyond the indentation that was active when starting to parse the message. It will therefore match either a restoration of the original indentation or an outdent to an even more reduced indentation. Note that the start position is not necessarily where the first token of the message occurred, since methods may start with leading arguments. In that case, the indentation refers to the whitespace at the start of the line where that leading argument begins.

The indentation is treated merely as a filter, and no call argument is introduced by the notation.