diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
index b83ed4c..3d660d5 100644
--- a/.cargo_vcs_info.json
+++ b/.cargo_vcs_info.json
@@ -1,5 +1,5 @@
 {
   "git": {
-    "sha1": "5a3570163b7e998b62ee9315522c37465b3cd12b"
+    "sha1": "3ea9e3eca7b762c30fbc09205522e3935cd70052"
   }
 }
diff --git a/Android.bp b/Android.bp
index cc02488..a0c5415 100644
--- a/Android.bp
+++ b/Android.bp
@@ -43,7 +43,7 @@
     host_supported: true,
     crate_name: "regex_syntax",
     srcs: ["src/lib.rs"],
-    edition: "2015",
+    edition: "2018",
     features: [
         "default",
         "unicode",
@@ -63,7 +63,7 @@
     srcs: ["src/lib.rs"],
     test_suites: ["general-tests"],
     auto_gen_config: true,
-    edition: "2015",
+    edition: "2018",
     features: [
         "default",
         "unicode",
diff --git a/Cargo.toml b/Cargo.toml
index 877b230..ca93a6e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,8 +11,9 @@
 # will likely look very different (and much more reasonable)
 
 [package]
+edition = "2018"
 name = "regex-syntax"
-version = "0.6.23"
+version = "0.6.25"
 authors = ["The Rust Project Developers"]
 description = "A regular expression parser."
 homepage = "https://github.com/rust-lang/regex"
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index 8461178..1359aa1 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,6 +1,6 @@
 [package]
 name = "regex-syntax"
-version = "0.6.23"  #:version
+version = "0.6.25"  #:version
 authors = ["The Rust Project Developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rust-lang/regex"
@@ -8,6 +8,7 @@
 homepage = "https://github.com/rust-lang/regex"
 description = "A regular expression parser."
 workspace = ".."
+edition = "2018"
 
 # Features are documented in the "Crate features" section of the crate docs:
 # https://docs.rs/regex-syntax/*/#crate-features
diff --git a/METADATA b/METADATA
index 47fd83e..b0811ec 100644
--- a/METADATA
+++ b/METADATA
@@ -7,13 +7,13 @@
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/regex-syntax/regex-syntax-0.6.23.crate"
+    value: "https://static.crates.io/crates/regex-syntax/regex-syntax-0.6.25.crate"
   }
-  version: "0.6.23"
+  version: "0.6.25"
   license_type: NOTICE
   last_upgrade_date {
     year: 2021
-    month: 4
-    day: 1
+    month: 5
+    day: 19
   }
 }
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 695cd9b..3625313 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -2,16 +2,16 @@
 {
   "presubmit": [
     {
-      "name": "regex-syntax_device_test_src_lib"
+      "name": "keystore2_test"
     },
     {
       "name": "libsqlite3-sys_device_test_src_lib"
     },
     {
-      "name": "vpnprofilestore_test"
+      "name": "regex-syntax_device_test_src_lib"
     },
     {
-      "name": "keystore2_test"
+      "name": "vpnprofilestore_test"
     }
   ]
 }
diff --git a/benches/bench.rs b/benches/bench.rs
index ba7f81c..d4703d4 100644
--- a/benches/bench.rs
+++ b/benches/bench.rs
@@ -1,6 +1,5 @@
 #![feature(test)]
 
-extern crate regex_syntax;
 extern crate test;
 
 use regex_syntax::Parser;
diff --git a/src/ast/mod.rs b/src/ast/mod.rs
index 7179f2d..9b9127b 100644
--- a/src/ast/mod.rs
+++ b/src/ast/mod.rs
@@ -6,7 +6,7 @@
 use std::error;
 use std::fmt;
 
-pub use ast::visitor::{visit, Visitor};
+pub use crate::ast::visitor::{visit, Visitor};
 
 pub mod parse;
 pub mod print;
@@ -220,13 +220,13 @@
 }
 
 impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        ::error::Formatter::from(self).fmt(f)
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        crate::error::Formatter::from(self).fmt(f)
     }
 }
 
 impl fmt::Display for ErrorKind {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         use self::ErrorKind::*;
         match *self {
             CaptureLimitExceeded => write!(
@@ -328,7 +328,7 @@
 }
 
 impl fmt::Debug for Span {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "Span({:?}, {:?})", self.start, self.end)
     }
 }
@@ -361,7 +361,7 @@
 }
 
 impl fmt::Debug for Position {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(
             f,
             "Position(o: {:?}, l: {:?}, c: {:?})",
@@ -542,8 +542,8 @@
 /// This implementation uses constant stack space and heap space proportional
 /// to the size of the `Ast`.
 impl fmt::Display for Ast {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        use ast::print::Printer;
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        use crate::ast::print::Printer;
         Printer::new().print(self, f)
     }
 }
diff --git a/src/ast/parse.rs b/src/ast/parse.rs
index 55c5f79..e62a7c2 100644
--- a/src/ast/parse.rs
+++ b/src/ast/parse.rs
@@ -7,10 +7,10 @@
 use std::mem;
 use std::result;
 
-use ast::{self, Ast, Position, Span};
-use either::Either;
+use crate::ast::{self, Ast, Position, Span};
+use crate::either::Either;
 
-use is_meta_character;
+use crate::is_meta_character;
 
 type Result<T> = result::Result<T, ast::Error>;
 
@@ -58,10 +58,10 @@
     /// then return an error.
     fn into_class_set_item<P: Borrow<Parser>>(
         self,
-        p: &ParserI<P>,
+        p: &ParserI<'_, P>,
     ) -> Result<ast::ClassSetItem> {
         use self::Primitive::*;
-        use ast::ClassSetItem;
+        use crate::ast::ClassSetItem;
 
         match self {
             Literal(lit) => Ok(ClassSetItem::Literal(lit)),
@@ -79,7 +79,7 @@
     /// dot), then return an error.
     fn into_class_literal<P: Borrow<Parser>>(
         self,
-        p: &ParserI<P>,
+        p: &ParserI<'_, P>,
     ) -> Result<ast::Literal> {
         use self::Primitive::*;
 
@@ -2137,7 +2137,7 @@
 /// A type that traverses a fully parsed Ast and checks whether its depth
 /// exceeds the specified nesting limit. If it does, then an error is returned.
 #[derive(Debug)]
-struct NestLimiter<'p, 's: 'p, P: 'p + 's> {
+struct NestLimiter<'p, 's, P> {
     /// The parser that is checking the nest limit.
     p: &'p ParserI<'s, P>,
     /// The current depth while walking an Ast.
@@ -2312,7 +2312,7 @@
     use std::ops::Range;
 
     use super::{Parser, ParserBuilder, ParserI, Primitive};
-    use ast::{self, Ast, Position, Span};
+    use crate::ast::{self, Ast, Position, Span};
 
     // Our own assert_eq, which has slightly better formatting (but honestly
     // still kind of crappy).
@@ -2357,21 +2357,24 @@
         str.to_string()
     }
 
-    fn parser(pattern: &str) -> ParserI<Parser> {
+    fn parser(pattern: &str) -> ParserI<'_, Parser> {
         ParserI::new(Parser::new(), pattern)
     }
 
-    fn parser_octal(pattern: &str) -> ParserI<Parser> {
+    fn parser_octal(pattern: &str) -> ParserI<'_, Parser> {
         let parser = ParserBuilder::new().octal(true).build();
         ParserI::new(parser, pattern)
     }
 
-    fn parser_nest_limit(pattern: &str, nest_limit: u32) -> ParserI<Parser> {
+    fn parser_nest_limit(
+        pattern: &str,
+        nest_limit: u32,
+    ) -> ParserI<'_, Parser> {
         let p = ParserBuilder::new().nest_limit(nest_limit).build();
         ParserI::new(p, pattern)
     }
 
-    fn parser_ignore_whitespace(pattern: &str) -> ParserI<Parser> {
+    fn parser_ignore_whitespace(pattern: &str) -> ParserI<'_, Parser> {
         let p = ParserBuilder::new().ignore_whitespace(true).build();
         ParserI::new(p, pattern)
     }
diff --git a/src/ast/print.rs b/src/ast/print.rs
index 1b9bc41..283ce4c 100644
--- a/src/ast/print.rs
+++ b/src/ast/print.rs
@@ -4,8 +4,8 @@
 
 use std::fmt;
 
-use ast::visitor::{self, Visitor};
-use ast::{self, Ast};
+use crate::ast::visitor::{self, Visitor};
+use crate::ast::{self, Ast};
 
 /// A builder for constructing a printer.
 ///
@@ -86,7 +86,7 @@
     }
 
     fn visit_post(&mut self, ast: &Ast) -> fmt::Result {
-        use ast::Class;
+        use crate::ast::Class;
 
         match *ast {
             Ast::Empty(_) => Ok(()),
@@ -126,7 +126,7 @@
         &mut self,
         ast: &ast::ClassSetItem,
     ) -> Result<(), Self::Err> {
-        use ast::ClassSetItem::*;
+        use crate::ast::ClassSetItem::*;
 
         match *ast {
             Empty(_) => Ok(()),
@@ -155,7 +155,7 @@
 
 impl<'p, W: fmt::Write> Writer<'p, W> {
     fn fmt_group_pre(&mut self, ast: &ast::Group) -> fmt::Result {
-        use ast::GroupKind::*;
+        use crate::ast::GroupKind::*;
         match ast.kind {
             CaptureIndex(_) => self.wtr.write_str("("),
             CaptureName(ref x) => {
@@ -178,7 +178,7 @@
     }
 
     fn fmt_repetition(&mut self, ast: &ast::Repetition) -> fmt::Result {
-        use ast::RepetitionKind::*;
+        use crate::ast::RepetitionKind::*;
         match ast.op.kind {
             ZeroOrOne if ast.greedy => self.wtr.write_str("?"),
             ZeroOrOne => self.wtr.write_str("??"),
@@ -200,7 +200,7 @@
         &mut self,
         ast: &ast::RepetitionRange,
     ) -> fmt::Result {
-        use ast::RepetitionRange::*;
+        use crate::ast::RepetitionRange::*;
         match *ast {
             Exactly(x) => write!(self.wtr, "{{{}}}", x),
             AtLeast(x) => write!(self.wtr, "{{{},}}", x),
@@ -209,7 +209,7 @@
     }
 
     fn fmt_literal(&mut self, ast: &ast::Literal) -> fmt::Result {
-        use ast::LiteralKind::*;
+        use crate::ast::LiteralKind::*;
 
         match ast.kind {
             Verbatim => self.wtr.write_char(ast.c),
@@ -256,7 +256,7 @@
     }
 
     fn fmt_assertion(&mut self, ast: &ast::Assertion) -> fmt::Result {
-        use ast::AssertionKind::*;
+        use crate::ast::AssertionKind::*;
         match ast.kind {
             StartLine => self.wtr.write_str("^"),
             EndLine => self.wtr.write_str("$"),
@@ -275,7 +275,7 @@
     }
 
     fn fmt_flags(&mut self, ast: &ast::Flags) -> fmt::Result {
-        use ast::{Flag, FlagsItemKind};
+        use crate::ast::{Flag, FlagsItemKind};
 
         for item in &ast.items {
             match item.kind {
@@ -315,7 +315,7 @@
         &mut self,
         ast: &ast::ClassSetBinaryOpKind,
     ) -> fmt::Result {
-        use ast::ClassSetBinaryOpKind::*;
+        use crate::ast::ClassSetBinaryOpKind::*;
         match *ast {
             Intersection => self.wtr.write_str("&&"),
             Difference => self.wtr.write_str("--"),
@@ -324,7 +324,7 @@
     }
 
     fn fmt_class_perl(&mut self, ast: &ast::ClassPerl) -> fmt::Result {
-        use ast::ClassPerlKind::*;
+        use crate::ast::ClassPerlKind::*;
         match ast.kind {
             Digit if ast.negated => self.wtr.write_str(r"\D"),
             Digit => self.wtr.write_str(r"\d"),
@@ -336,7 +336,7 @@
     }
 
     fn fmt_class_ascii(&mut self, ast: &ast::ClassAscii) -> fmt::Result {
-        use ast::ClassAsciiKind::*;
+        use crate::ast::ClassAsciiKind::*;
         match ast.kind {
             Alnum if ast.negated => self.wtr.write_str("[:^alnum:]"),
             Alnum => self.wtr.write_str("[:alnum:]"),
@@ -370,8 +370,8 @@
     }
 
     fn fmt_class_unicode(&mut self, ast: &ast::ClassUnicode) -> fmt::Result {
-        use ast::ClassUnicodeKind::*;
-        use ast::ClassUnicodeOpKind::*;
+        use crate::ast::ClassUnicodeKind::*;
+        use crate::ast::ClassUnicodeOpKind::*;
 
         if ast.negated {
             self.wtr.write_str(r"\P")?;
@@ -397,7 +397,7 @@
 #[cfg(test)]
 mod tests {
     use super::Printer;
-    use ast::parse::ParserBuilder;
+    use crate::ast::parse::ParserBuilder;
 
     fn roundtrip(given: &str) {
         roundtrip_with(|b| b, given);
diff --git a/src/ast/visitor.rs b/src/ast/visitor.rs
index 3eaa4b0..a0d1e7d 100644
--- a/src/ast/visitor.rs
+++ b/src/ast/visitor.rs
@@ -1,6 +1,6 @@
 use std::fmt;
 
-use ast::{self, Ast};
+use crate::ast::{self, Ast};
 
 /// A trait for visiting an abstract syntax tree (AST) in depth first order.
 ///
@@ -478,7 +478,7 @@
 }
 
 impl<'a> fmt::Debug for ClassFrame<'a> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let x = match *self {
             ClassFrame::Union { .. } => "Union",
             ClassFrame::Binary { .. } => "Binary",
@@ -490,7 +490,7 @@
 }
 
 impl<'a> fmt::Debug for ClassInduct<'a> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let x = match *self {
             ClassInduct::Item(it) => match *it {
                 ast::ClassSetItem::Empty(_) => "Item(Empty)",
diff --git a/src/error.rs b/src/error.rs
index 93c2b0d..71cfa42 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -3,8 +3,8 @@
 use std::fmt;
 use std::result;
 
-use ast;
-use hir;
+use crate::ast;
+use crate::hir;
 
 /// A type alias for dealing with errors returned by this crate.
 pub type Result<T> = result::Result<T, Error>;
@@ -52,7 +52,7 @@
 }
 
 impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match *self {
             Error::Parse(ref x) => x.fmt(f),
             Error::Translate(ref x) => x.fmt(f),
@@ -67,7 +67,7 @@
 /// readable format. Most of its complexity is from interspersing notational
 /// markers pointing out the position where an error occurred.
 #[derive(Debug)]
-pub struct Formatter<'e, E: 'e> {
+pub struct Formatter<'e, E> {
     /// The original regex pattern in which the error occurred.
     pattern: &'e str,
     /// The error kind. It must impl fmt::Display.
@@ -102,7 +102,7 @@
 }
 
 impl<'e, E: fmt::Display> fmt::Display for Formatter<'e, E> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let spans = Spans::from_formatter(self);
         if self.pattern.contains('\n') {
             let divider = repeat_char('~', 79);
@@ -286,7 +286,7 @@
 
 #[cfg(test)]
 mod tests {
-    use ast::parse::Parser;
+    use crate::ast::parse::Parser;
 
     fn assert_panic_message(pattern: &str, expected_msg: &str) -> () {
         let result = Parser::new().parse(pattern);
diff --git a/src/hir/interval.rs b/src/hir/interval.rs
index 51eed52..cfaa2cb 100644
--- a/src/hir/interval.rs
+++ b/src/hir/interval.rs
@@ -4,7 +4,7 @@
 use std::slice;
 use std::u8;
 
-use unicode;
+use crate::unicode;
 
 // This module contains an *internal* implementation of interval sets.
 //
@@ -60,7 +60,7 @@
     /// Return an iterator over all intervals in this set.
     ///
     /// The iterator yields intervals in ascending order.
-    pub fn iter(&self) -> IntervalSetIter<I> {
+    pub fn iter(&self) -> IntervalSetIter<'_, I> {
         IntervalSetIter(self.ranges.iter())
     }
 
@@ -322,7 +322,7 @@
 
 /// An iterator over intervals.
 #[derive(Debug)]
-pub struct IntervalSetIter<'a, I: 'a>(slice::Iter<'a, I>);
+pub struct IntervalSetIter<'a, I>(slice::Iter<'a, I>);
 
 impl<'a, I> Iterator for IntervalSetIter<'a, I> {
     type Item = &'a I;
diff --git a/src/hir/literal/mod.rs b/src/hir/literal/mod.rs
index 3ba225c..25ee88b 100644
--- a/src/hir/literal/mod.rs
+++ b/src/hir/literal/mod.rs
@@ -8,7 +8,7 @@
 use std::mem;
 use std::ops;
 
-use hir::{self, Hir, HirKind};
+use crate::hir::{self, Hir, HirKind};
 
 /// A set of literal byte strings extracted from a regular expression.
 ///
@@ -838,7 +838,7 @@
 }
 
 impl fmt::Debug for Literals {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("Literals")
             .field("lits", &self.lits)
             .field("limit_size", &self.limit_size)
@@ -882,7 +882,7 @@
 }
 
 impl fmt::Debug for Literal {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         if self.is_cut() {
             write!(f, "Cut({})", escape_unicode(&self.v))
         } else {
@@ -977,8 +977,8 @@
     use std::fmt;
 
     use super::{escape_bytes, Literal, Literals};
-    use hir::Hir;
-    use ParserBuilder;
+    use crate::hir::Hir;
+    use crate::ParserBuilder;
 
     // To make test failures easier to read.
     #[derive(Debug, Eq, PartialEq)]
@@ -1017,7 +1017,7 @@
     }
 
     impl fmt::Debug for ULiteral {
-        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
             if self.is_cut() {
                 write!(f, "Cut({})", self.v)
             } else {
diff --git a/src/hir/mod.rs b/src/hir/mod.rs
index 53d90b8..4969f12 100644
--- a/src/hir/mod.rs
+++ b/src/hir/mod.rs
@@ -8,12 +8,12 @@
 use std::result;
 use std::u8;
 
-use ast::Span;
-use hir::interval::{Interval, IntervalSet, IntervalSetIter};
-use unicode;
+use crate::ast::Span;
+use crate::hir::interval::{Interval, IntervalSet, IntervalSetIter};
+use crate::unicode;
 
-pub use hir::visitor::{visit, Visitor};
-pub use unicode::CaseFoldError;
+pub use crate::hir::visitor::{visit, Visitor};
+pub use crate::unicode::CaseFoldError;
 
 mod interval;
 pub mod literal;
@@ -123,13 +123,13 @@
 }
 
 impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        ::error::Formatter::from(self).fmt(f)
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        crate::error::Formatter::from(self).fmt(f)
     }
 }
 
 impl fmt::Display for ErrorKind {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         // TODO: Remove this on the next breaking semver release.
         #[allow(deprecated)]
         f.write_str(self.description())
@@ -727,8 +727,8 @@
 /// This implementation uses constant stack space and heap space proportional
 /// to the size of the `Hir`.
 impl fmt::Display for Hir {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        use hir::print::Printer;
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        use crate::hir::print::Printer;
         Printer::new().print(self, f)
     }
 }
@@ -859,7 +859,7 @@
     /// Return an iterator over all ranges in this class.
     ///
     /// The iterator yields ranges in ascending order.
-    pub fn iter(&self) -> ClassUnicodeIter {
+    pub fn iter(&self) -> ClassUnicodeIter<'_> {
         ClassUnicodeIter(self.set.iter())
     }
 
@@ -972,7 +972,7 @@
 }
 
 impl fmt::Debug for ClassUnicodeRange {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let start = if !self.start.is_whitespace() && !self.start.is_control()
         {
             self.start.to_string()
@@ -1102,7 +1102,7 @@
     /// Return an iterator over all ranges in this class.
     ///
     /// The iterator yields ranges in ascending order.
-    pub fn iter(&self) -> ClassBytesIter {
+    pub fn iter(&self) -> ClassBytesIter<'_> {
         ClassBytesIter(self.set.iter())
     }
 
@@ -1258,7 +1258,7 @@
 }
 
 impl fmt::Debug for ClassBytesRange {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let mut debug = f.debug_struct("ClassBytesRange");
         if self.start <= 0x7F {
             debug.field("start", &(self.start as char));
diff --git a/src/hir/print.rs b/src/hir/print.rs
index eb44b93..ff18c6e 100644
--- a/src/hir/print.rs
+++ b/src/hir/print.rs
@@ -4,9 +4,9 @@
 
 use std::fmt;
 
-use hir::visitor::{self, Visitor};
-use hir::{self, Hir, HirKind};
-use is_meta_character;
+use crate::hir::visitor::{self, Visitor};
+use crate::hir::{self, Hir, HirKind};
+use crate::is_meta_character;
 
 /// A builder for constructing a printer.
 ///
@@ -239,7 +239,7 @@
 #[cfg(test)]
 mod tests {
     use super::Printer;
-    use ParserBuilder;
+    use crate::ParserBuilder;
 
     fn roundtrip(given: &str, expected: &str) {
         roundtrip_with(|b| b, given, expected);
diff --git a/src/hir/translate.rs b/src/hir/translate.rs
index 44d2813..99c9493 100644
--- a/src/hir/translate.rs
+++ b/src/hir/translate.rs
@@ -5,9 +5,9 @@
 use std::cell::{Cell, RefCell};
 use std::result;
 
-use ast::{self, Ast, Span, Visitor};
-use hir::{self, Error, ErrorKind, Hir};
-use unicode::{self, ClassQuery};
+use crate::ast::{self, Ast, Span, Visitor};
+use crate::hir::{self, Error, ErrorKind, Hir};
+use crate::unicode::{self, ClassQuery};
 
 type Result<T> = result::Result<T, Error>;
 
@@ -533,7 +533,7 @@
         &mut self,
         op: &ast::ClassSetBinaryOp,
     ) -> Result<()> {
-        use ast::ClassSetBinaryOpKind::*;
+        use crate::ast::ClassSetBinaryOpKind::*;
 
         if self.flags().unicode() {
             let mut rhs = self.pop().unwrap().unwrap_class_unicode();
@@ -819,7 +819,7 @@
         &self,
         ast_class: &ast::ClassUnicode,
     ) -> Result<hir::ClassUnicode> {
-        use ast::ClassUnicodeKind::*;
+        use crate::ast::ClassUnicodeKind::*;
 
         if !self.flags().unicode() {
             return Err(
@@ -857,7 +857,7 @@
         &self,
         ast_class: &ast::ClassPerl,
     ) -> Result<hir::ClassUnicode> {
-        use ast::ClassPerlKind::*;
+        use crate::ast::ClassPerlKind::*;
 
         assert!(self.flags().unicode());
         let result = match ast_class.kind {
@@ -879,7 +879,7 @@
         &self,
         ast_class: &ast::ClassPerl,
     ) -> hir::ClassBytes {
-        use ast::ClassPerlKind::*;
+        use crate::ast::ClassPerlKind::*;
 
         assert!(!self.flags().unicode());
         let mut class = match ast_class.kind {
@@ -1077,7 +1077,7 @@
 }
 
 fn ascii_class(kind: &ast::ClassAsciiKind) -> &'static [(char, char)] {
-    use ast::ClassAsciiKind::*;
+    use crate::ast::ClassAsciiKind::*;
     match *kind {
         Alnum => &[('0', '9'), ('A', 'Z'), ('a', 'z')],
         Alpha => &[('A', 'Z'), ('a', 'z')],
@@ -1105,10 +1105,10 @@
 
 #[cfg(test)]
 mod tests {
-    use ast::parse::ParserBuilder;
-    use ast::{self, Ast, Position, Span};
-    use hir::{self, Hir, HirKind};
-    use unicode::{self, ClassQuery};
+    use crate::ast::parse::ParserBuilder;
+    use crate::ast::{self, Ast, Position, Span};
+    use crate::hir::{self, Hir, HirKind};
+    use crate::unicode::{self, ClassQuery};
 
     use super::{ascii_class, TranslatorBuilder};
 
@@ -1256,7 +1256,7 @@
     }
 
     #[allow(dead_code)]
-    fn hir_uclass_query(query: ClassQuery) -> Hir {
+    fn hir_uclass_query(query: ClassQuery<'_>) -> Hir {
         Hir::class(hir::Class::Unicode(unicode::class(query).unwrap()))
     }
 
@@ -1315,7 +1315,7 @@
 
     #[allow(dead_code)]
     fn hir_union(expr1: Hir, expr2: Hir) -> Hir {
-        use hir::Class::{Bytes, Unicode};
+        use crate::hir::Class::{Bytes, Unicode};
 
         match (expr1.into_kind(), expr2.into_kind()) {
             (HirKind::Class(Unicode(mut c1)), HirKind::Class(Unicode(c2))) => {
@@ -1332,7 +1332,7 @@
 
     #[allow(dead_code)]
     fn hir_difference(expr1: Hir, expr2: Hir) -> Hir {
-        use hir::Class::{Bytes, Unicode};
+        use crate::hir::Class::{Bytes, Unicode};
 
         match (expr1.into_kind(), expr2.into_kind()) {
             (HirKind::Class(Unicode(mut c1)), HirKind::Class(Unicode(c2))) => {
diff --git a/src/hir/visitor.rs b/src/hir/visitor.rs
index 81a9e98..4f5a709 100644
--- a/src/hir/visitor.rs
+++ b/src/hir/visitor.rs
@@ -1,4 +1,4 @@
-use hir::{self, Hir, HirKind};
+use crate::hir::{self, Hir, HirKind};
 
 /// A trait for visiting the high-level IR (HIR) in depth first order.
 ///
diff --git a/src/lib.rs b/src/lib.rs
index 6be634a..9e9af75 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -158,9 +158,9 @@
 #![warn(missing_debug_implementations)]
 #![forbid(unsafe_code)]
 
-pub use error::{Error, Result};
-pub use parser::{Parser, ParserBuilder};
-pub use unicode::UnicodeWordError;
+pub use crate::error::{Error, Result};
+pub use crate::parser::{Parser, ParserBuilder};
+pub use crate::unicode::UnicodeWordError;
 
 pub mod ast;
 mod either;
diff --git a/src/parser.rs b/src/parser.rs
index 00f1391..eb363ca 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -1,7 +1,7 @@
-use ast;
-use hir;
+use crate::ast;
+use crate::hir;
 
-use Result;
+use crate::Result;
 
 /// A builder for a regular expression parser.
 ///
diff --git a/src/unicode.rs b/src/unicode.rs
index 73df698..b894c7d 100644
--- a/src/unicode.rs
+++ b/src/unicode.rs
@@ -2,7 +2,7 @@
 use std::fmt;
 use std::result;
 
-use hir;
+use crate::hir;
 
 /// A type alias for errors specific to Unicode handling of classes.
 pub type Result<T> = result::Result<T, Error>;
@@ -38,7 +38,7 @@
 impl error::Error for CaseFoldError {}
 
 impl fmt::Display for CaseFoldError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(
             f,
             "Unicode-aware case folding is not available \
@@ -58,7 +58,7 @@
 impl error::Error for UnicodeWordError {}
 
 impl fmt::Display for UnicodeWordError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(
             f,
             "Unicode-aware \\w class is not available \
@@ -95,7 +95,7 @@
         c: char,
     ) -> FoldResult<result::Result<impl Iterator<Item = char>, Option<char>>>
     {
-        use unicode_tables::case_folding_simple::CASE_FOLDING_SIMPLE;
+        use crate::unicode_tables::case_folding_simple::CASE_FOLDING_SIMPLE;
 
         Ok(CASE_FOLDING_SIMPLE
             .binary_search_by_key(&c, |&(c1, _)| c1)
@@ -130,8 +130,8 @@
 
     #[cfg(feature = "unicode-case")]
     fn imp(start: char, end: char) -> FoldResult<bool> {
+        use crate::unicode_tables::case_folding_simple::CASE_FOLDING_SIMPLE;
         use std::cmp::Ordering;
-        use unicode_tables::case_folding_simple::CASE_FOLDING_SIMPLE;
 
         assert!(start <= end);
         Ok(CASE_FOLDING_SIMPLE
@@ -285,7 +285,7 @@
 
 /// Looks up a Unicode class given a query. If one doesn't exist, then
 /// `None` is returned.
-pub fn class(query: ClassQuery) -> Result<hir::ClassUnicode> {
+pub fn class(query: ClassQuery<'_>) -> Result<hir::ClassUnicode> {
     use self::CanonicalClassQuery::*;
 
     match query.canonicalize()? {
@@ -330,7 +330,7 @@
 
     #[cfg(feature = "unicode-perl")]
     fn imp() -> Result<hir::ClassUnicode> {
-        use unicode_tables::perl_word::PERL_WORD;
+        use crate::unicode_tables::perl_word::PERL_WORD;
         Ok(hir_class(PERL_WORD))
     }
 
@@ -348,13 +348,13 @@
 
     #[cfg(all(feature = "unicode-perl", not(feature = "unicode-bool")))]
     fn imp() -> Result<hir::ClassUnicode> {
-        use unicode_tables::perl_space::WHITE_SPACE;
+        use crate::unicode_tables::perl_space::WHITE_SPACE;
         Ok(hir_class(WHITE_SPACE))
     }
 
     #[cfg(feature = "unicode-bool")]
     fn imp() -> Result<hir::ClassUnicode> {
-        use unicode_tables::property_bool::WHITE_SPACE;
+        use crate::unicode_tables::property_bool::WHITE_SPACE;
         Ok(hir_class(WHITE_SPACE))
     }
 
@@ -372,13 +372,13 @@
 
     #[cfg(all(feature = "unicode-perl", not(feature = "unicode-gencat")))]
     fn imp() -> Result<hir::ClassUnicode> {
-        use unicode_tables::perl_decimal::DECIMAL_NUMBER;
+        use crate::unicode_tables::perl_decimal::DECIMAL_NUMBER;
         Ok(hir_class(DECIMAL_NUMBER))
     }
 
     #[cfg(feature = "unicode-gencat")]
     fn imp() -> Result<hir::ClassUnicode> {
-        use unicode_tables::general_category::DECIMAL_NUMBER;
+        use crate::unicode_tables::general_category::DECIMAL_NUMBER;
         Ok(hir_class(DECIMAL_NUMBER))
     }
 
@@ -405,9 +405,9 @@
 
     #[cfg(feature = "unicode-perl")]
     fn imp(c: char) -> result::Result<bool, UnicodeWordError> {
-        use is_word_byte;
+        use crate::is_word_byte;
+        use crate::unicode_tables::perl_word::PERL_WORD;
         use std::cmp::Ordering;
-        use unicode_tables::perl_word::PERL_WORD;
 
         if c <= 0x7F as char && is_word_byte(c as u8) {
             return Ok(true);
@@ -482,7 +482,7 @@
         feature = "unicode-segment",
     ))]
     fn imp(name: &str) -> Result<Option<&'static str>> {
-        use unicode_tables::property_names::PROPERTY_NAMES;
+        use crate::unicode_tables::property_names::PROPERTY_NAMES;
 
         Ok(PROPERTY_NAMES
             .binary_search_by_key(&name, |&(n, _)| n)
@@ -539,7 +539,7 @@
         feature = "unicode-segment",
     ))]
     fn imp(name: &'static str) -> Result<Option<PropertyValues>> {
-        use unicode_tables::property_values::PROPERTY_VALUES;
+        use crate::unicode_tables::property_values::PROPERTY_VALUES;
 
         Ok(PROPERTY_VALUES
             .binary_search_by_key(&name, |&(n, _)| n)
@@ -578,7 +578,7 @@
 
     #[cfg(feature = "unicode-age")]
     fn imp(canonical_age: &str) -> Result<impl Iterator<Item = Range>> {
-        use unicode_tables::age;
+        use crate::unicode_tables::age;
 
         const AGES: &'static [(&'static str, Range)] = &[
             ("V1_1", age::V1_1),
@@ -631,7 +631,7 @@
 
     #[cfg(feature = "unicode-gencat")]
     fn imp(name: &'static str) -> Result<hir::ClassUnicode> {
-        use unicode_tables::general_category::BY_NAME;
+        use crate::unicode_tables::general_category::BY_NAME;
         match name {
             "ASCII" => Ok(hir_class(&[('\0', '\x7F')])),
             "Any" => Ok(hir_class(&[('\0', '\u{10FFFF}')])),
@@ -666,7 +666,7 @@
 
     #[cfg(feature = "unicode-script")]
     fn imp(name: &'static str) -> Result<hir::ClassUnicode> {
-        use unicode_tables::script::BY_NAME;
+        use crate::unicode_tables::script::BY_NAME;
         property_set(BY_NAME, name)
             .map(hir_class)
             .ok_or(Error::PropertyValueNotFound)
@@ -691,7 +691,7 @@
 
     #[cfg(feature = "unicode-script")]
     fn imp(name: &'static str) -> Result<hir::ClassUnicode> {
-        use unicode_tables::script_extension::BY_NAME;
+        use crate::unicode_tables::script_extension::BY_NAME;
         property_set(BY_NAME, name)
             .map(hir_class)
             .ok_or(Error::PropertyValueNotFound)
@@ -715,7 +715,7 @@
 
     #[cfg(feature = "unicode-bool")]
     fn imp(name: &'static str) -> Result<hir::ClassUnicode> {
-        use unicode_tables::property_bool::BY_NAME;
+        use crate::unicode_tables::property_bool::BY_NAME;
         property_set(BY_NAME, name)
             .map(hir_class)
             .ok_or(Error::PropertyNotFound)
@@ -743,7 +743,7 @@
 
     #[cfg(feature = "unicode-segment")]
     fn imp(name: &'static str) -> Result<hir::ClassUnicode> {
-        use unicode_tables::grapheme_cluster_break::BY_NAME;
+        use crate::unicode_tables::grapheme_cluster_break::BY_NAME;
         property_set(BY_NAME, name)
             .map(hir_class)
             .ok_or(Error::PropertyValueNotFound)
@@ -767,7 +767,7 @@
 
     #[cfg(feature = "unicode-segment")]
     fn imp(name: &'static str) -> Result<hir::ClassUnicode> {
-        use unicode_tables::word_break::BY_NAME;
+        use crate::unicode_tables::word_break::BY_NAME;
         property_set(BY_NAME, name)
             .map(hir_class)
             .ok_or(Error::PropertyValueNotFound)
@@ -791,7 +791,7 @@
 
     #[cfg(feature = "unicode-segment")]
     fn imp(name: &'static str) -> Result<hir::ClassUnicode> {
-        use unicode_tables::sentence_break::BY_NAME;
+        use crate::unicode_tables::sentence_break::BY_NAME;
         property_set(BY_NAME, name)
             .map(hir_class)
             .ok_or(Error::PropertyValueNotFound)
diff --git a/src/utf8.rs b/src/utf8.rs
index 947ba7c..dc05503 100644
--- a/src/utf8.rs
+++ b/src/utf8.rs
@@ -203,7 +203,7 @@
 }
 
 impl fmt::Debug for Utf8Sequence {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         use self::Utf8Sequence::*;
         match *self {
             One(ref r) => write!(f, "{:?}", r),
@@ -237,7 +237,7 @@
 }
 
 impl fmt::Debug for Utf8Range {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         if self.start == self.end {
             write!(f, "[{:X}]", self.start)
         } else {
@@ -331,7 +331,7 @@
 }
 
 impl fmt::Debug for ScalarRange {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "ScalarRange({:X}, {:X})", self.start, self.end)
     }
 }
@@ -457,7 +457,7 @@
 mod tests {
     use std::char;
 
-    use utf8::{Utf8Range, Utf8Sequences};
+    use crate::utf8::{Utf8Range, Utf8Sequences};
 
     fn rutf8(s: u8, e: u8) -> Utf8Range {
         Utf8Range::new(s, e)
@@ -504,7 +504,7 @@
 
     #[test]
     fn bmp() {
-        use utf8::Utf8Sequence::*;
+        use crate::utf8::Utf8Sequence::*;
 
         let seqs = Utf8Sequences::new('\u{0}', '\u{FFFF}').collect::<Vec<_>>();
         assert_eq!(
@@ -538,7 +538,7 @@
 
     #[test]
     fn reverse() {
-        use utf8::Utf8Sequence::*;
+        use crate::utf8::Utf8Sequence::*;
 
         let mut s = One(rutf8(0xA, 0xB));
         s.reverse();
diff --git a/test b/test
index 9970a99..4b1b9fb 100755
--- a/test
+++ b/test
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 # This is a convenience script for running a broad swath of the syntax tests.
 echo "===== DEFAULT FEATURES ==="
 cargo test