3 files changed, 13 insertions, 7 deletions
diff --git a/helix-term/Cargo.toml b/helix-term/Cargo.toml
index 378f25f8..672e6f84 100644
--- a/helix-term/Cargo.toml
+++ b/helix-term/Cargo.toml
@@ -10,7 +10,7 @@ repository = "https://github.com/helix-editor/helix"
 homepage = "https://helix-editor.com"
 include = ["src/**/*", "README.md"]
 default-run = "hx"
-rust-version = "1.65"
+rust-version = "1.70"
 
 [features]
 default = ["git"]
diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index bc54abaa..cd053266 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -1318,7 +1318,7 @@ fn extend_next_long_word_end(cx: &mut Context) {
     extend_word_impl(cx, movement::move_next_long_word_end)
 }
 
-/// Separate branch to find_char designed only for <ret> char.
+/// Separate branch to find_char designed only for `<ret>` char.
 //
 // This is necessary because the one document can have different line endings inside. And we
 // cannot predict what character to find when <ret> is pressed. On the current line it can be `lf`
@@ -5606,12 +5606,18 @@ fn shell(cx: &mut compositor::Context, cmd: &str, behavior: &ShellBehavior) {
         };
 
         // These `usize`s cannot underflow because selection ranges cannot overlap.
-        // Once the MSRV is 1.66.0 (mixed_integer_ops is stabilized), we can use checked
-        // arithmetic to assert this.
-        let anchor = (to as isize + offset - deleted_len as isize) as usize;
+        let anchor = to
+            .checked_add_signed(offset)
+            .expect("Selection ranges cannot overlap")
+            .checked_sub(deleted_len)
+            .expect("Selection ranges cannot overlap");
         let new_range = Range::new(anchor, anchor + output_len).with_direction(range.direction());
         ranges.push(new_range);
-        offset = offset + output_len as isize - deleted_len as isize;
+        offset = offset
+            .checked_add_unsigned(output_len)
+            .expect("Selection ranges cannot overlap")
+            .checked_sub_unsigned(deleted_len)
+            .expect("Selection ranges cannot overlap");
 
         changes.push((from, to, Some(output)));
     }
diff --git a/helix-term/src/commands/lsp.rs b/helix-term/src/commands/lsp.rs
index 57be1267..87400461 100644
--- a/helix-term/src/commands/lsp.rs
+++ b/helix-term/src/commands/lsp.rs
@@ -49,7 +49,7 @@ use std::{
 /// If there is no configured language server that supports the feature, this displays a status message.
 /// Using this macro in a context where the editor automatically queries the LSP
 /// (instead of when the user explicitly does so via a keybind like `gd`)
-/// will spam the "No configured language server supports <feature>" status message confusingly.
+/// will spam the "No configured language server supports \<feature>" status message confusingly.
 #[macro_export]
 macro_rules! language_server_with_feature {
     ($editor:expr, $doc:expr, $feature:expr) => {{