add: whatever I had

dice-sim/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "dice-sim"
+version = "0.1.0"

dice-sim/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "dice-sim"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

dice-sim/src/lib.rs

@@ -0,0 +1,27 @@
+// Stores something like 1d6
+pub struct DiceExpr {
+    count: usize,
+    dice: usize,
+}
+
+type Op2 = (Box<Expr>, Box<Expr>);
+
+type Op1 = DiceExpr;
+
+type PResult<'a, R> = Result<(R, &'a [char]), String>;
+
+pub enum Expr {
+    Add(Op2),
+    Sub(Op2),
+    Const(Op1),
+}
+
+fn take_while<'a>(expr: &'a [char]) -> PResult<'a, usize> {
+
+fn take_int<'a>(expr: &'a [char]) -> PResult<'a, usize> {
+    unimplemented!()
+}
+
+pub fn parse<'a>(expr: &'a [char]) -> PResult<'a, Expr> {
+    unimplemented!()
+}

dice-sim/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}