diff --git a/regex-syntax/src/hir/literal.rs b/regex-syntax/src/hir/literal.rs
index 2fbcdcff2..121216ae5 100644
--- a/regex-syntax/src/hir/literal.rs
+++ b/regex-syntax/src/hir/literal.rs
@@ -186,7 +186,7 @@ impl Extractor {
             }
             Class(hir::Class::Bytes(ref cls)) => self.extract_class_bytes(cls),
             Repetition(ref rep) => self.extract_repetition(rep),
-            Capture(hir::Capture { ref hir, .. }) => self.extract(hir),
+            Capture(hir::Capture { ref sub, .. }) => self.extract(sub),
             Concat(ref hirs) => match self.kind {
                 ExtractKind::Prefix => self.extract_concat(hirs.iter()),
                 ExtractKind::Suffix => self.extract_concat(hirs.iter().rev()),
@@ -448,7 +448,7 @@ impl Extractor {
     /// literals being extracted, which might actually be a better prefilter
     /// than just 'a'.
     fn extract_repetition(&self, rep: &hir::Repetition) -> Seq {
-        let mut subseq = self.extract(&rep.hir);
+        let mut subseq = self.extract(&rep.sub);
         match *rep {
             hir::Repetition { min: 0, max, greedy, .. } => {
                 // When 'max=1', we can retain exactness, since 'a?' is
diff --git a/regex-syntax/src/hir/mod.rs b/regex-syntax/src/hir/mod.rs
index 7be604a66..a2465e98a 100644
--- a/regex-syntax/src/hir/mod.rs
+++ b/regex-syntax/src/hir/mod.rs
@@ -323,7 +323,7 @@ impl Hir {
         if rep.min == 0 && rep.max == Some(0) {
             return Hir::empty();
         } else if rep.min == 1 && rep.max == Some(1) {
-            return *rep.hir;
+            return *rep.sub;
         }
         let props = Properties::repetition(&rep);
         Hir { kind: HirKind::Repetition(rep), props }
@@ -1437,7 +1437,7 @@ pub struct Capture {
     /// The name of the capture, if it exists.
     pub name: Option<Box<str>>,
     /// The expression inside the capturing group, which may be empty.
-    pub hir: Box<Hir>,
+    pub sub: Box<Hir>,
 }
 
 /// The high-level intermediate representation of a repetition operator.
@@ -1467,7 +1467,7 @@ pub struct Repetition {
     /// not. However, this can be inverted via the `U` "ungreedy" flag.
     pub greedy: bool,
     /// The expression being repeated.
-    pub hir: Box<Hir>,
+    pub sub: Box<Hir>,
 }
 
 impl Repetition {
@@ -1523,8 +1523,8 @@ impl Drop for Hir {
             | HirKind::Literal(_)
             | HirKind::Class(_)
             | HirKind::Look(_) => return,
-            HirKind::Capture(ref x) if !x.hir.kind.has_subexprs() => return,
-            HirKind::Repetition(ref x) if !x.hir.kind.has_subexprs() => return,
+            HirKind::Capture(ref x) if !x.sub.kind.has_subexprs() => return,
+            HirKind::Repetition(ref x) if !x.sub.kind.has_subexprs() => return,
             HirKind::Concat(ref x) if x.is_empty() => return,
             HirKind::Alternation(ref x) if x.is_empty() => return,
             _ => {}
@@ -1538,10 +1538,10 @@ impl Drop for Hir {
                 | HirKind::Class(_)
                 | HirKind::Look(_) => {}
                 HirKind::Capture(ref mut x) => {
-                    stack.push(mem::replace(&mut x.hir, Hir::empty()));
+                    stack.push(mem::replace(&mut x.sub, Hir::empty()));
                 }
                 HirKind::Repetition(ref mut x) => {
-                    stack.push(mem::replace(&mut x.hir, Hir::empty()));
+                    stack.push(mem::replace(&mut x.sub, Hir::empty()));
                 }
                 HirKind::Concat(ref mut x) => {
                     stack.extend(x.drain(..));
@@ -1926,7 +1926,7 @@ impl Properties {
 
     /// Create a new set of HIR properties for a repetition.
     fn repetition(rep: &Repetition) -> Properties {
-        let p = rep.hir.properties();
+        let p = rep.sub.properties();
         let minimum_len = p.minimum_len().map(|child_min| {
             let rep_min = usize::try_from(rep.min).unwrap_or(usize::MAX);
             child_min.saturating_mul(rep_min)
@@ -1957,7 +1957,7 @@ impl Properties {
 
     /// Create a new set of HIR properties for a capture.
     fn capture(capture: &Capture) -> Properties {
-        let p = capture.hir.properties();
+        let p = capture.sub.properties();
         Properties(Box::new(PropertiesI {
             captures_len: p.captures_len().saturating_add(1),
             literal: false,
@@ -3054,13 +3054,13 @@ mod tests {
                 expr = Hir::capture(Capture {
                     index: 1,
                     name: None,
-                    hir: Box::new(expr),
+                    sub: Box::new(expr),
                 });
                 expr = Hir::repetition(Repetition {
                     min: 0,
                     max: Some(1),
                     greedy: true,
-                    hir: Box::new(expr),
+                    sub: Box::new(expr),
                 });
 
                 expr = Hir {
diff --git a/regex-syntax/src/hir/print.rs b/regex-syntax/src/hir/print.rs
index ef654d40c..40f8905b7 100644
--- a/regex-syntax/src/hir/print.rs
+++ b/regex-syntax/src/hir/print.rs
@@ -478,7 +478,7 @@ mod tests {
                 min: 1,
                 max: None,
                 greedy: true,
-                hir: Box::new(Hir::literal("ab".as_bytes())),
+                sub: Box::new(Hir::literal("ab".as_bytes())),
             }),
             Hir::literal("y".as_bytes()),
         ]);
@@ -490,7 +490,7 @@ mod tests {
                 min: 1,
                 max: None,
                 greedy: true,
-                hir: Box::new(Hir::concat(alloc::vec![
+                sub: Box::new(Hir::concat(alloc::vec![
                     Hir::look(hir::Look::Start),
                     Hir::look(hir::Look::End),
                 ])),
@@ -512,7 +512,7 @@ mod tests {
                 min: 1,
                 max: None,
                 greedy: true,
-                hir: Box::new(Hir::alternation(alloc::vec![
+                sub: Box::new(Hir::alternation(alloc::vec![
                     Hir::literal("cd".as_bytes()),
                     Hir::literal("ef".as_bytes()),
                 ])),
@@ -527,7 +527,7 @@ mod tests {
                 min: 1,
                 max: None,
                 greedy: true,
-                hir: Box::new(Hir::alternation(alloc::vec![
+                sub: Box::new(Hir::alternation(alloc::vec![
                     Hir::look(hir::Look::Start),
                     Hir::look(hir::Look::End),
                 ])),
diff --git a/regex-syntax/src/hir/translate.rs b/regex-syntax/src/hir/translate.rs
index fcef47a1e..b1ebf7b17 100644
--- a/regex-syntax/src/hir/translate.rs
+++ b/regex-syntax/src/hir/translate.rs
@@ -912,7 +912,7 @@ impl<'t, 'p> TranslatorI<'t, 'p> {
             // in which the data type is defined handles this automatically.
             ast::GroupKind::NonCapturing(_) => return expr,
         };
-        Hir::capture(hir::Capture { index, name, hir: Box::new(expr) })
+        Hir::capture(hir::Capture { index, name, sub: Box::new(expr) })
     }
 
     fn hir_repetition(&self, rep: &ast::Repetition, expr: Hir) -> Hir {
@@ -937,7 +937,7 @@ impl<'t, 'p> TranslatorI<'t, 'p> {
             min,
             max,
             greedy,
-            hir: Box::new(expr),
+            sub: Box::new(expr),
         })
     }
 
@@ -1353,14 +1353,14 @@ mod tests {
     }
 
     fn hir_capture(index: u32, expr: Hir) -> Hir {
-        Hir::capture(hir::Capture { index, name: None, hir: Box::new(expr) })
+        Hir::capture(hir::Capture { index, name: None, sub: Box::new(expr) })
     }
 
     fn hir_capture_name(index: u32, name: &str, expr: Hir) -> Hir {
         Hir::capture(hir::Capture {
             index,
             name: Some(name.into()),
-            hir: Box::new(expr),
+            sub: Box::new(expr),
         })
     }
 
@@ -1369,7 +1369,7 @@ mod tests {
             min: 0,
             max: Some(1),
             greedy,
-            hir: Box::new(expr),
+            sub: Box::new(expr),
         })
     }
 
@@ -1378,7 +1378,7 @@ mod tests {
             min: 0,
             max: None,
             greedy,
-            hir: Box::new(expr),
+            sub: Box::new(expr),
         })
     }
 
@@ -1387,7 +1387,7 @@ mod tests {
             min: 1,
             max: None,
             greedy,
-            hir: Box::new(expr),
+            sub: Box::new(expr),
         })
     }
 
@@ -1396,7 +1396,7 @@ mod tests {
             min,
             max,
             greedy,
-            hir: Box::new(expr),
+            sub: Box::new(expr),
         })
     }
 
diff --git a/regex-syntax/src/hir/visitor.rs b/regex-syntax/src/hir/visitor.rs
index ba1db238a..e5f15cf1c 100644
--- a/regex-syntax/src/hir/visitor.rs
+++ b/regex-syntax/src/hir/visitor.rs
@@ -195,8 +195,8 @@ impl<'a> Frame<'a> {
     /// child HIR node to visit.
     fn child(&self) -> &'a Hir {
         match *self {
-            Frame::Repetition(rep) => &rep.hir,
-            Frame::Capture(capture) => &capture.hir,
+            Frame::Repetition(rep) => &rep.sub,
+            Frame::Capture(capture) => &capture.sub,
             Frame::Concat { head, .. } => head,
             Frame::Alternation { head, .. } => head,
         }
diff --git a/src/compile.rs b/src/compile.rs
index 50ab78700..9ee52354d 100644
--- a/src/compile.rs
+++ b/src/compile.rs
@@ -368,7 +368,7 @@ impl Compiler {
                     self.c_empty_look(prog::EmptyLook::NotWordBoundary)
                 }
             },
-            Capture(hir::Capture { index, ref name, ref hir }) => {
+            Capture(hir::Capture { index, ref name, ref sub }) => {
                 if index as usize >= self.compiled.captures.len() {
                     let name = match *name {
                         None => None,
@@ -379,7 +379,7 @@ impl Compiler {
                         self.capture_name_idx.insert(name, index as usize);
                     }
                 }
-                self.c_capture(2 * index as usize, hir)
+                self.c_capture(2 * index as usize, sub)
             }
             Concat(ref es) => {
                 if self.compiled.is_reverse {
@@ -434,7 +434,7 @@ impl Compiler {
                 min: 0,
                 max: None,
                 greedy: false,
-                hir: Box::new(hir),
+                sub: Box::new(hir),
             }))?
             .unwrap())
     }
@@ -644,14 +644,14 @@ impl Compiler {
 
     fn c_repeat(&mut self, rep: &hir::Repetition) -> ResultOrEmpty {
         match (rep.min, rep.max) {
-            (0, Some(1)) => self.c_repeat_zero_or_one(&rep.hir, rep.greedy),
-            (0, None) => self.c_repeat_zero_or_more(&rep.hir, rep.greedy),
-            (1, None) => self.c_repeat_one_or_more(&rep.hir, rep.greedy),
+            (0, Some(1)) => self.c_repeat_zero_or_one(&rep.sub, rep.greedy),
+            (0, None) => self.c_repeat_zero_or_more(&rep.sub, rep.greedy),
+            (1, None) => self.c_repeat_one_or_more(&rep.sub, rep.greedy),
             (min, None) => {
-                self.c_repeat_range_min_or_more(&rep.hir, rep.greedy, min)
+                self.c_repeat_range_min_or_more(&rep.sub, rep.greedy, min)
             }
             (min, Some(max)) => {
-                self.c_repeat_range(&rep.hir, rep.greedy, min, max)
+                self.c_repeat_range(&rep.sub, rep.greedy, min, max)
             }
         }
     }