optional mimalloc dep for 30% speed up

Cargo.lock

@@ -2,6 +2,49 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "cc"
+version = "1.2.65"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e228eec9be7c17ccb640b59b36a5cd805ea2a564a4c5e162c2f659fea30d3b96"
+dependencies = [
+ "find-msvc-tools",
+ "shlex",
+]
+
+[[package]]
+name = "find-msvc-tools"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5baebc0774151f905a1a2cc41989300b1e6fbb29aff0ceffa1064fdd3088d582"
+
+[[package]]
+name = "libmimalloc-sys"
+version = "0.1.49"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a45a52f43e1c16f667ccfe4dd8c85b7f7c204fd5e3bf46c5b0db9a5c3c0b8e9"
+dependencies = [
+ "cc",
+]
+
+[[package]]
+name = "mimalloc"
+version = "0.1.52"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d4139bb28d14ad1facf21d5eb8825051b326e172d216b39f6d31df53cc97862"
+dependencies = [
+ "libmimalloc-sys",
+]
+
+[[package]]
+name = "shlex"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8fadd59c855ef2080decdef8ff161eb6661b86933c9d82e5ba29dc602a55aba"
+
 [[package]]
 name = "zern"
 version = "0.3.0"
+dependencies = [
+ "mimalloc",
+]

Cargo.toml

@@ -3,3 +3,9 @@ name = "zern"
 version = "0.3.0"
 edition = "2024"
 license = "BSD-2-Clause"
+
+[dependencies]
+mimalloc = { version = "0.1.52", optional = true }
+
+[features]
+mimalloc = ["dep:mimalloc"]

src/main.rs

@@ -12,6 +12,10 @@ use std::{
 
 use tokenizer::ZernError;
 
+#[cfg(feature = "mimalloc")]
+#[global_allocator]
+static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
+
 fn compile_file(args: Args) -> Result<(), ZernError> {
     let source = match fs::read_to_string(&args.path) {
         Ok(x) => x,