Use default allocator instead of wee_alloc in numbat-wasm

Crate has major unresolved issues such as memory leaks
(rustwasm/wee_alloc#106). wee_alloc's last
commit at the moment was made shy of 3 years ago, and the latest release
is over 4 years old.

numbat-wasm/Cargo.toml

@@ -19,11 +19,6 @@ wasm-bindgen = "0.2.63"
 # code size when deploying.
 console_error_panic_hook = { version = "0.1.6", optional = true }
 
-# `wee_alloc` is a tiny allocator for wasm that is only ~1K in code size
-# compared to the default allocator's ~10K. It is slower than the default
-# allocator, however.
-wee_alloc = { version = "0.4.5", optional = true }
-
 numbat = { path = "../numbat", default-features = false }
 html-escape = "0.2.13"
 termcolor = "1.3.0"

numbat-wasm/build.sh

@@ -3,4 +3,4 @@
 set -euo pipefail
 
 rm -rf www/pkg
-wasm-pack build --features=wee_alloc --target=web --out-dir=www/pkg
+wasm-pack build --target=web --out-dir=www/pkg

numbat-wasm/src/lib.rs

@@ -19,12 +19,6 @@ use numbat::resolver::CodeSource;
 use numbat::{markup as m, NameResolutionError, NumbatError};
 use numbat::{Context, InterpreterSettings};
 
-// When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
-// allocator.
-#[cfg(feature = "wee_alloc")]
-#[global_allocator]
-static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
-
 #[wasm_bindgen]
 pub fn setup_panic_hook() {
     utils::set_panic_hook();