Rust-scm

• A mini Scheme interpreter using Rust
• My first Rust program, should not be the best Rust programming idiom.

Benchmarks

• 0.1

Env use Vec, should be very slow.

test eval::eval_bench   ... bench:   1500071 ns/iter (+/- 256219)
test eval::lambda_bench ... bench:    469318 ns/iter (+/- 86833)

Env v2, use String as env key, not the SymboNode

test env::env_bench      ... bench:   8108095 ns/iter (+/- 1626045)
test env::env_bench_iter ... bench:    623332 ns/iter (+/- 639534)
test eval::eval_bench    ... bench:   1469169 ns/iter (+/- 333122)
test eval::lambda_bench  ... bench:    487463 ns/iter (+/- 91102)

Env v3, use HashMap represent env

test env::env_bench      ... bench:   1220791 ns/iter (+/- 174220)
test env::env_bench_iter ... bench:    773957 ns/iter (+/- 128140)
test eval::eval_bench    ... bench:   1517271 ns/iter (+/- 267982)
test eval::lambda_bench  ... bench:    458025 ns/iter (+/- 100774)