--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.hgignore	Wed Oct 14 19:42:54 2020 +0200
@@ -0,0 +1,2 @@
+^target/
+glob:Cargo.lock

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Cargo.toml	Wed Oct 14 19:42:54 2020 +0200
@@ -0,0 +1,12 @@
+[package]
+name = "memoize"
+version = "0.1.0"
+authors = ["Lewin Bormann <lewin@lewin-bormann.info>"]
+edition = "2018"
+
+[lib]
+proc-macro = true
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+lazy_static = "1.4"

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/lib.rs	Wed Oct 14 19:42:54 2020 +0200
@@ -0,0 +1,34 @@
+#![crate_type = "proc-macro"]
+
+use proc_macro::TokenStream;
+
+use lazy_static::lazy_static;
+
+use std::collections::HashMap;
+use std::sync::Mutex;
+
+#[proc_macro_attribute]
+pub fn memoize(attr: TokenStream, item: TokenStream) -> TokenStream {
+    let func = parse_macro_input
+    item
+}
+
+lazy_static! {
+    static ref STORE: Mutex<HashMap<i32, bool>> = Mutex::new(HashMap::new());
+}
+
+// fn memoizer(a: i32) -> bool {
+//    let mut hm = &mut STORE.lock().unwrap();
+//    if let Some(r) = hm.get(&a) {
+//        return *r;
+//    }
+//    let r = memoized_function(a);
+//    hm.insert(a, r);
+//    r
+// }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+}