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brag/yaragg-lib/yaragg/examples/add-mult.rkt

8 lines
153 B
Racket

#lang brag
expr : term (/'+' term)*
@term : factor (/'*' @factor)*
factor : ("0" | "1" | "2" | "3"
| "4" | "5" | "6" | "7"
| "8" | "9")+