Peter Goodspeed-Niklaus

Rust implementation could be more idiomatic

2

[Running example on Rust Playground](https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=5bb594ff7de5bf3b24520eb131930511). Note: the example above uses two external libraries. This adds some complexity in the event that you want to avoid `cargo` for some reason. ##...

SkipList doesn't have the same semantics as a Vec

3

Given the following library code: ```rust extern crate skiplist; use skiplist::SkipList; pub const TWENTY_SEVENTEEN: usize = 2017; pub const FIFTY_MILLION: usize = 50_000_000; type List = Vec; pub struct Spinner...

If you're doing a bunch of bit-twiddling, it's tedious to append `:09b_4` to every expression. Better to do `output :09b_4` and have it automatically apply to every subsequent expression unless...

Choose backing type at evaluation time, not in the CLI

1

It should be possible for us to parse evaluation type metadata in parallel with the expression itself and use that instead of a CLI switch. This will improve the usability...

Use case: ```sh $ calc "load $history_path; history" [0]: 1+1 2 [1]: 3*pi**2 29.608813203268074 $ calc "load $history_path; @ + 1; save $history_path" 30.608813203268074 ```

The parser should be able to evaluate commands like `help`, `help FOO`, `exit`, etc. `eval_and_print` should be able to delegate to appropriate command handlers in that case. Minimal commands necessary...

Add arbitrary precision integer support. - `bigint`: signed arbitrary-precision integer operations building on the [`num_bigint` crate](https://crates.io/crates/num_bigint)

We should allow both fixed and arbitrary precision rational support. - `rat64`: signed 64-bit rational operations building on the [`num_rational` crate](https://crates.io/crates/num_rational) - `bigrat`: signed arbitrary-precision rational operations building on the...

Allow arbitrary fixed-position decimal operations using the [`bigdecimal` crate](https://crates.io/crates/bigdecimal)`.

I'd accidentally written an [incorrect grammar](https://github.com/coriolinus/adventofcode-2020/blob/7369d05e0941b1dad215f4ff0105695b4e1e8e87/day19/src/parser.lalrpop). The problem is the trailing `.` on [this line](https://github.com/coriolinus/adventofcode-2020/blob/7369d05e0941b1dad215f4ff0105695b4e1e8e87/day19/src/parser.lalrpop#L47). LALRPOP did not flag this grammar as incorrect, but just pasted the action, including the...