The rationale is similar to that in commit b3d8f5da (GenEx: Parse comma after colon tokens specially, 2012-10-04), in that colon tokens should not be parsed as identifier-argument delimiters after the first colon.
The rationale is similar to that in commit b3d8f5da (GenEx: Parse comma after colon tokens specially, 2012-10-04), in that colon tokens should not be parsed as identifier-argument delimiters after the first colon.