Update hashbrown requirement from 0.14.3 to 0.15.0 (#148)

* Update hashbrown requirement from 0.14.3 to 0.15.0

Updates the requirements on [hashbrown](https://github.com/rust-lang/hashbrown) to permit the latest version.
- [Changelog](https://github.com/rust-lang/hashbrown/blob/master/CHANGELOG.md)
- [Commits](rust-lang/hashbrown@v0.14.3...v0.15.0)

---
updated-dependencies:
- dependency-name: hashbrown
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

* fix new lint warnings

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jeff Crocker <[email protected]>

Cargo.toml

@@ -46,7 +46,7 @@ use_debug = "deny"
 tracing = { version = "0.1.37", optional = true }
 tracing-subscriber = { version = "0.3.16", optional = true, features = ["env-filter"] }
 tracing-flame = { version = "0.2.0", optional = true }
-hashbrown = "0.14.3"
+hashbrown = "0.15.0"
 
 [dependencies.rand]
 version = "0.8.0"

src/earley/traversal.rs

@@ -20,7 +20,7 @@ pub(crate) enum TermMatch<'gram> {
 #[derive(Debug)]
 pub(crate) struct Traversal<'gram> {
     pub id: TraversalId,
-    /// The unmatched "right hand side" [`Term]s
+    /// The unmatched "right hand side" [`Term`]s
     pub unmatched: &'gram [crate::Term],
     /// The input text available for parsing
     pub input_range: InputRange<'gram>,

src/grammar.rs

@@ -25,7 +25,7 @@ pub struct ParseTree<'gram> {
 }
 
 impl<'gram> ParseTree<'gram> {
-    pub(crate) fn new(lhs: &'gram Term, rhs: Vec<ParseTreeNode<'gram>>) -> Self {
+    pub(crate) const fn new(lhs: &'gram Term, rhs: Vec<ParseTreeNode<'gram>>) -> Self {
         Self { lhs, rhs }
     }
 }
@@ -247,7 +247,10 @@ impl Grammar {
     }
 
     /// Parse input strings according to `Grammar`
-    pub fn parse_input<'gram>(&'gram self, input: &'gram str) -> impl Iterator<Item = ParseTree> {
+    pub fn parse_input<'gram>(
+        &'gram self,
+        input: &'gram str,
+    ) -> impl Iterator<Item = ParseTree<'gram>> {
         crate::earley::parse(self, input)
     }
 

src/production.rs

@@ -20,7 +20,7 @@ pub struct Production {
 impl Production {
     /// Construct a new `Production`
     #[must_use]
-    pub fn new() -> Production {
+    pub const fn new() -> Production {
         Production {
             lhs: Term::Nonterminal(String::new()),
             rhs: vec![],
@@ -29,7 +29,7 @@ impl Production {
 
     /// Construct an `Production` from `Expression`s
     #[must_use]
-    pub fn from_parts(t: Term, e: Vec<Expression>) -> Production {
+    pub const fn from_parts(t: Term, e: Vec<Expression>) -> Production {
         Production { lhs: t, rhs: e }
     }