As I've just discovered, brackets work the same as parentheses in Scheme expressions:
```
#[set-global-staff-size 26]
{ c' }
```
Guile allows this by default; the read option `square-brackets` is
active for compatibility with R6RS.
Shall we use and advertise this? Some user Scheme code could probably
be made more readable:
```
(let [(foo ...)
(bar ...)]
...)
(cond
[question1 expression1]
[question2 expression2]
[question3 expression3]
[else expression4])
```
Werner
