Sometimes we need to use pattern matching to assign a name to both a complete subpattern and also its individual constituents.
The as pattern operator satisfies this need:
linux$ cat my-script
#!/usr/bin/mythryl
case ((1,2),(3,4),(5,6))
( pair1 as (a,b),
pair2 as (c,d),
pair3 as (e,f)
)
=> printf "(%d,%d) sum to %d, (%d,%d) sum to %d, (%d,%d) sum to %d\n"
a b ((+)pair1)
c d ((+)pair2)
e f ((+)pair3);
esac;
linux$ ./my-script
(1,2) sum to 3, (3,4) sum to 7, (5,6) sum to 11