rust-analyzer

diff --git a/crates/parser/src/input.rs b/crates/parser/src/input.rs
index 57eeb431cd..42e8a400ed 100644
--- a/crates/parser/src/input.rs
+++ b/crates/parser/src/input.rs

@@ -97,7 +97,7 @@ impl Input {

let b_idx = n % (bits::BITS as usize);

(idx, b_idx)

}

- fn len(&self) -> usize {

+ pub fn len(&self) -> usize {

self.kind.len()

}

diff --git a/crates/parser/src/lexed_str.rs b/crates/parser/src/lexed_str.rs
index 7c78ba8faf..d7eec6cde8 100644
--- a/crates/parser/src/lexed_str.rs
+++ b/crates/parser/src/lexed_str.rs

@@ -150,7 +150,12 @@ struct Converter<'a> {

impl<'a> Converter<'a> {

fn new(edition: Edition, text: &'a str) -> Self {

Self {

- res: LexedStr { text, kind: Vec::new(), start: Vec::new(), error: Vec::new() },

+ res: LexedStr {

+ text,

+ kind: Vec::with_capacity(text.len() / 3),

+ start: Vec::with_capacity(text.len() / 3),

+ error: Vec::new(),

+ },

offset: 0,

edition,

}

diff --git a/crates/parser/src/parser.rs b/crates/parser/src/parser.rs
index c41bd593c6..4557078de9 100644
--- a/crates/parser/src/parser.rs
+++ b/crates/parser/src/parser.rs

@@ -32,7 +32,7 @@ const PARSER_STEP_LIMIT: usize = if cfg!(debug_assertions) { 150_000 } else { 15

impl<'t> Parser<'t> {

pub(super) fn new(inp: &'t Input) -> Parser<'t> {

- Parser { inp, pos: 0, events: Vec::new(), steps: Cell::new(0) }

+ Parser { inp, pos: 0, events: Vec::with_capacity(2 * inp.len()), steps: Cell::new(0) }

}

pub(crate) fn finish(self) -> Vec<Event> {

diff --git a/crates/span/src/ast_id.rs b/crates/span/src/ast_id.rs
index e54e0bd2fc..3bf14dea75 100644
--- a/crates/span/src/ast_id.rs
+++ b/crates/span/src/ast_id.rs

@@ -603,8 +603,9 @@ impl AstIdMap {

// After all, the block will then contain the *outer* item, so we allocate

// an ID for it anyway.

let mut blocks = Vec::new();

- let mut curr_layer = vec![(node.clone(), None)];

- let mut next_layer = vec![];

+ let mut curr_layer = Vec::with_capacity(32);

+ curr_layer.push((node.clone(), None));

+ let mut next_layer = Vec::with_capacity(32);

while !curr_layer.is_empty() {

curr_layer.drain(..).for_each(|(node, parent_idx)| {

let mut preorder = node.preorder();