fixed warnings in mers, but one warning in parse.rs will stay

mers/src/libs/mod.rs

@@ -2,7 +2,7 @@ pub mod inlib;
 pub mod path;
 
 use std::{
-    collections::{HashMap, HashSet},
+    collections::HashMap,
     io::{self, BufRead, BufReader, Read, Write},
     path::PathBuf,
     process::{Child, ChildStdin, ChildStdout, Command, Stdio},
@@ -55,11 +55,24 @@ sending data: (all ints are encoded so that the most significant data is sent FI
 
 #[derive(Debug)]
 pub struct Lib {
+    name: String,
     process: Child,
     stdin: Arc<Mutex<ChildStdin>>,
     stdout: Arc<Mutex<BufReader<ChildStdout>>>,
     pub registered_fns: Vec<(String, Vec<VType>, VType)>,
 }
+impl Drop for Lib {
+    fn drop(&mut self) {
+        if self.process.try_wait().is_err() {
+            if let Err(e) = self.process.kill() {
+                eprint!(
+                    "Warn: tried to kill lib process for library \"{}\", but failed: {e:?}",
+                    self.name
+                );
+            }
+        }
+    }
+}
 impl Lib {
     pub fn launch(
         mut exec: Command,
@@ -131,6 +144,7 @@ impl Lib {
             }
             writeln!(stdin, "init_finished").unwrap();
             Ok(Self {
+                name: name.to_string(),
                 process: handle,
                 stdin: Arc::new(Mutex::new(stdin)),
                 stdout: Arc::new(Mutex::new(stdout)),

mers/src/main.rs

@@ -1,8 +1,4 @@
-use std::{
-    fs,
-    sync::{Arc, Mutex},
-    time::Instant,
-};
+use std::{fs, sync::Arc, time::Instant};
 
 use notify::Watcher as FsWatcher;
 
@@ -10,6 +6,8 @@ pub mod libs;
 pub mod parse;
 pub mod script;
 
+// necessary because the lib target in Cargo.toml also points here. TODO: update Cargo.toml to have a lib target that is separate from the bin one (=> doesn't point to main)
+#[allow(unused)]
 fn main() {
     let args: Vec<_> = std::env::args().skip(1).collect();
     let path = std::env::args().nth(1).unwrap();

mers/src/script/block.rs

@@ -8,7 +8,7 @@ use std::{
 
 use crate::libs;
 
-use self::to_runnable::{GInfo, ToRunnableError};
+use self::to_runnable::ToRunnableError;
 
 use super::{
     builtins::BuiltinFunction,

mers/src/script/mod.rs

@@ -2,4 +2,3 @@ pub mod block;
 pub mod builtins;
 pub mod val_data;
 pub mod val_type;
-pub mod value;