bump MSRV to 1.70.0 (#8877)

* rust-toolchain.toml: bump MSRV to 1.70.0

With Firefox 120 released on 21 November 2023, the MSRV is now 1.70.0.

* Fix cargo fmt with Rust 1.70.0

* Fix cargo clippy with Rust 1.70.0

* Fix cargo doc with Rust 1.70.0

* rust-toolchain.toml: add clippy component

* .github: bump dtolnay/rust-toolchain to 1.70

* helix-term: bump rust-version to 1.70

* helix-view/gutter: use checked_ilog10 to count digits

* helix-core/syntax: use MAIN_SEPARATOR_STR constant

* helix-view/handlers/dap: use Display impl for displaying process spawn error

* WIP: helix-term/commands: use checked math to assert ranges cannot overlap

1 files changed, 1 insertions, 3 deletions

diff --git a/helix-view/src/handlers/dap.rs b/helix-view/src/handlers/dap.rs
index 3da01494..e1437bef 100644
--- a/helix-view/src/handlers/dap.rs
+++ b/helix-view/src/handlers/dap.rs
@@ -369,9 +369,7 @@ impl Editor {
                     {
                         Ok(process) => process,
                         Err(err) => {
-                            // TODO replace the pretty print {:?} with a regular format {}
-                            // when the MSRV is raised to 1.60.0
-                            self.set_error(format!("Error starting external terminal: {:?}", err));
+                            self.set_error(format!("Error starting external terminal: {}", err));
                             return true;
                         }
                     };