#< (srfi :105) >
(print '{a + b})
or if you are using 0.3.7 (currently it's HEAD version) you can also use it with this syntax
#!read-macro=srfi/:105
(print '{a + b})
or
#!read-macro=curly-infix
(print '{a + b})
The latter form is much easier to keep compatibility with other implementation
if it can handle #!curly-infix
notation.
NOTE: this library is merged into Sagittarius itself since 0.3.8.