Expand comment on NonMutatingUseContext.

rust-lang · Apr 29, 2023 · 4ec76df · 4ec76df
1 parent 9325a25
commit 4ec76df
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/compiler/rustc_middle/src/mir/visit.rs b/compiler/rustc_middle/src/mir/visit.rs
@@ -1252,6 +1252,9 @@ pub enum NonMutatingUseContext {
     /// AddressOf for *const pointer.
     AddressOf,
     /// PlaceMention statement.
+    ///
+    /// This statement is executed as a check that the `Place` is live without reading from it,
+    /// so it must be considered as a non-mutating use.
     PlaceMention,
     /// Used as base for another place, e.g., `x` in `x.y`. Will not mutate the place.
     /// For example, the projection `x.y` is not marked as a mutation in these cases: