Migrate to edition 2021

crates/project_model/src/cargo_workspace.rs

@@ -1,6 +1,5 @@
 //! See [`CargoWorkspace`].
 
-use std::convert::{TryFrom, TryInto};
 use std::iter;
 use std::path::PathBuf;
 use std::{ops, process::Command};

crates/project_model/src/lib.rs

@@ -28,7 +28,6 @@ mod build_scripts;
 mod tests;
 
 use std::{
-    convert::{TryFrom, TryInto},
     fs::{self, read_dir, ReadDir},
     io,
     process::Command,

crates/project_model/src/manifest_path.rs

@@ -1,5 +1,5 @@
 //! See [`ManifestPath`].
-use std::{convert::TryFrom, ops, path::Path};
+use std::{ops, path::Path};
 
 use paths::{AbsPath, AbsPathBuf};
 

crates/project_model/src/sysroot.rs

@@ -4,7 +4,7 @@
 //! but we can't process `.rlib` and need source code instead. The source code
 //! is typically installed with `rustup component add rust-src` command.
 
-use std::{convert::TryFrom, env, fs, iter, ops, path::PathBuf, process::Command};
+use std::{env, fs, iter, ops, path::PathBuf, process::Command};
 
 use anyhow::{format_err, Result};
 use la_arena::{Arena, Idx};

crates/project_model/src/workspace.rs

@@ -2,7 +2,7 @@
 //! metadata` or `rust-project.json`) into representation stored in the salsa
 //! database -- `CrateGraph`.
 
-use std::{collections::VecDeque, convert::TryFrom, fmt, fs, process::Command};
+use std::{collections::VecDeque, fmt, fs, process::Command};
 
 use anyhow::{format_err, Context, Result};
 use base_db::{