func test():
# The following keywords are allowed as identifiers:
var match = "match"
print(match)
var PI = "PI"
print(PI)
var INF = "INF"
print(INF)
var NAN = "NAN"
print(NAN)
var TAU = "TAU"
print(TAU)
# New keyword for pattern guards.
var when = "when"
print(when)