[brackets] as (parens)

[alexshinn]

R6RS allows [] brackets as identical to parenthesis,
with the condition that they must balance. Do we
accept this extension, propose some other use for
brackets, or leave them unspecified?

[cowan]

MzScheme?, Gauche, Gambit, Chicken, Bigloo, SISC, Chez, SSCM, VSCM, and the R6RS Schemes support [+ 1 2] => 3.

MIT, Scheme48/scsh, Guile, Kawa, SCM, Scheme 9, Scheme 7, SXM, Chibi don't. Some throw lexical-syntax errors when they read the [, others complain that [+ is not a defined symbol.

I recommend that brackets mean the same as parens. I recommend against Interlisp-style closing of )s with ] and vice versa.

[kumoyuki]

ick. but probably livable. Why can't people just use real editors?

[arcfide]

Used to hate the idea, and now I really like them. YMMV.

[cowan]

The WG voted to reject this feature.