Rhyme is the Scheme interpreter which was implemented by Ruby. It makes to do R5RS based a goal. In other words, it isn't being based on R5RS at present.
lambda, if, set!, case, and, or, let, begin, define, =, <, >, <=, >=, zero?, positive?, negative?, odd?, even?, +, *, sqrt, expr, make-rectangular, make-polar, real-part, imag-part, magnitude, angle, not, boolean?, pair?, cons, car, cdr, set-car!, set-cdr!, caar, cadr, ..., null?, for-each, eval, scheme-report-environment, null-environment, display, newline
**It works by the limited status.(46/192)**
quote, cond, let*, letrec, do, let-syntax, syntax-rules, define-syntax, eqv?, eq?, equal?, number?, complex?, real?, rational?, integer?, max, min, -, /, abs, quotient, remainder, modulo, gcd, lcm, numerator, denominator, floor, ceiling, truncate, round, exp, log, sin, cos, tan, asin, acos, string->number, list?, list, memq, call-with-current-continuation, interaction-environment, load