Don't leak memory in background eval (#1869)

* Run a separate process for each background evaluation job

* Send over only the dependencies, not everything

* Remove ipc-channel

* Kill the child process if it times out

* Add some comments

Cargo.toml

@@ -55,7 +55,6 @@ git-version = "0.3.5"
 indexmap = "1.9.3"
 indoc = "2"
 insta = "1.29.0"
-ipc-channel = "0.18.0"
 js-sys = "0.3"
 lalrpop = "0.19.9"
 lalrpop-util = "0.19.9"
@@ -77,6 +76,7 @@ pyo3-build-config = "0.17.3"
 regex = "1"
 rustyline = "11.0"
 rustyline-derive = "0.8.0"
+scopeguard = "1.2.0"
 serde = "1.0.164"
 serde_json = "1.0.96"
 serde_repr = "0.1"

lsp/nls/Cargo.toml

@@ -35,14 +35,14 @@ crossbeam.workspace = true
 csv.workspace = true
 derive_more.workspace = true
 env_logger.workspace = true
-ipc-channel.workspace = true
 lalrpop-util.workspace = true
 lazy_static.workspace = true
 log.workspace = true
 lsp-server.workspace = true
 lsp-types.workspace = true
 nickel-lang-core.workspace = true
 regex.workspace = true
+scopeguard.workspace = true
 serde = { workspace = true, features = ["derive"] }
 serde_json.workspace = true
 thiserror.workspace = true