Anyway, I'm talking specifically about the use of the identifier "it" in Kotlin, not implicitly or contextually defined identifiers in general, which are indeed a much more widespread concept, embracing Perl's $_ and @_, awk's $0 (and for that matter $1 and $fieldnumber and so on), Dyalog APL's α and ω, Smalltalk's "self", C++'s "this", dynamically-scoped variables in general, and for that matter de Bruijn numbering.
