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Add rationale for RemoveUnneededDrops

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...since its name is very close to `RemoveUninitDrops`.
This commit is contained in:
Dylan MacKenzie 2021-11-30 15:03:43 -08:00
parent 4f7605b6fd
commit ce2959da97
1 changed files with 5 additions and 1 deletions
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6
compiler/rustc_mir_transform/src/remove_unneeded_drops.rs
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@ -1,4 +1,8 @@
//! This pass replaces a drop of a type that does not need dropping, with a goto
//! This pass replaces a drop of a type that does not need dropping, with a goto.
//!
//! When the MIR is built, we check `needs_drop` before emitting a `Drop` for a place. This pass is
//! useful because (unlike MIR building) it runs after type checking, so it can make use of
//! `Reveal::All` to provide more precies type information.
use crate::MirPass;
use rustc_middle::mir::*;