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hygiene: Remove some dead code

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This commit is contained in:
Vadim Petrochenkov 2019-06-20 10:34:51 +03:00
parent f1d4ebf015
commit 62a1f5dbc0
1 changed files with 1 additions and 27 deletions
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28
src/libsyntax_pos/hygiene.rs
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@ -31,7 +31,7 @@ use crate::edition::Edition;
use crate::symbol::{kw, Symbol};
use serialize::{Encodable, Decodable, Encoder, Decoder};
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::sync::Lrc;
use std::fmt;
@ -130,32 +130,6 @@ impl Mark {
HygieneData::with(|data| data.is_descendant_of(self, data.outer(ctxt)))
}
/// Computes a mark such that both input marks are descendants of (or equal to) the returned
/// mark. That is, the following holds:
///
/// ```rust
/// let la = least_ancestor(a, b);
/// assert!(a.is_descendant_of(la))
/// assert!(b.is_descendant_of(la))
/// ```
pub fn least_ancestor(mut a: Mark, mut b: Mark) -> Mark {
HygieneData::with(|data| {
// Compute the path from a to the root
let mut a_path = FxHashSet::<Mark>::default();
while a != Mark::root() {
a_path.insert(a);
a = data.marks[a.0 as usize].parent;
}
// While the path from b to the root hasn't intersected, move up the tree
while !a_path.contains(&b) {
b = data.marks[b.0 as usize].parent;
}
b
})
}
// Used for enabling some compatibility fallback in resolve.
#[inline]
pub fn looks_like_proc_macro_derive(self) -> bool {