diff options
Diffstat (limited to 'compiler/rustc_pattern_analysis/src')
| -rw-r--r-- | compiler/rustc_pattern_analysis/src/usefulness.rs | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/compiler/rustc_pattern_analysis/src/usefulness.rs b/compiler/rustc_pattern_analysis/src/usefulness.rs index 01f3962b31f..3141e992f33 100644 --- a/compiler/rustc_pattern_analysis/src/usefulness.rs +++ b/compiler/rustc_pattern_analysis/src/usefulness.rs @@ -555,7 +555,12 @@ use smallvec::{smallvec, SmallVec}; use std::fmt; +// It's not possible to only enable the `typed_arena` dependency when the `rustc` feature is off, so +// we use another feature instead. The crate won't compile if one of these isn't enabled. +#[cfg(feature = "rustc")] use rustc_arena::TypedArena; +#[cfg(feature = "stable")] +use typed_arena::Arena as TypedArena; use crate::constructor::{Constructor, ConstructorSet}; use crate::pat::{DeconstructedPat, WitnessPat}; |