diff --git a/src/codegen/bitfield_unit.rs b/src/codegen/bitfield_unit.rs
index 5c7a09bd6b..caab2dc69a 100755
--- a/src/codegen/bitfield_unit.rs
+++ b/src/codegen/bitfield_unit.rs
@@ -9,7 +9,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align>
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align>
 {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self {
             storage,
             align: [],
diff --git a/src/codegen/mod.rs b/src/codegen/mod.rs
index c3b8698319..551c0bdb91 100644
--- a/src/codegen/mod.rs
+++ b/src/codegen/mod.rs
@@ -410,7 +410,7 @@ impl CodeGenerator for Module {
                     utils::prepend_objc_header(ctx, &mut *result);
                 }
                 if result.saw_bitfield_unit {
-                    utils::prepend_bitfield_unit_type(&mut *result);
+                    utils::prepend_bitfield_unit_type(ctx, &mut *result);
                 }
             }
         };
@@ -3591,11 +3591,21 @@ mod utils {
     use ir::item::{Item, ItemCanonicalPath};
     use ir::ty::TypeKind;
     use proc_macro2;
+    use std::borrow::Cow;
     use std::mem;
     use std::str::FromStr;
 
-    pub fn prepend_bitfield_unit_type(result: &mut Vec<proc_macro2::TokenStream>) {
-        let bitfield_unit_type = proc_macro2::TokenStream::from_str(include_str!("./bitfield_unit.rs")).unwrap();
+    pub fn prepend_bitfield_unit_type(
+        ctx: &BindgenContext,
+        result: &mut Vec<proc_macro2::TokenStream>
+    ) {
+        let bitfield_unit_src = include_str!("./bitfield_unit.rs");
+        let bitfield_unit_src = if ctx.options().rust_features().min_const_fn {
+            Cow::Borrowed(bitfield_unit_src)
+        } else {
+            Cow::Owned(bitfield_unit_src.replace("const fn ", "fn "))
+        };
+        let bitfield_unit_type = proc_macro2::TokenStream::from_str(&bitfield_unit_src).unwrap();
         let bitfield_unit_type = quote!(#bitfield_unit_type);
 
         let items = vec![bitfield_unit_type];
diff --git a/src/features.rs b/src/features.rs
index 50759c3189..05f5dc422e 100644
--- a/src/features.rs
+++ b/src/features.rs
@@ -102,6 +102,8 @@ macro_rules! rust_target_base {
             => Stable_1_27 => 1.27;
             /// Rust stable 1.28
             => Stable_1_28 => 1.28;
+            /// Rust stable 1.30
+            => Stable_1_30 => 1.30;
             /// Rust stable 1.33
             => Stable_1_33 => 1.33;
             /// Nightly rust
@@ -192,6 +194,11 @@ rust_feature_def!(
         /// repr(transparent) ([PR](https://github.com/rust-lang/rust/pull/51562))
         => repr_transparent;
     }
+    Stable_1_30 {
+        /// `const fn` support for limited cases
+        /// ([PR](https://github.com/rust-lang/rust/pull/54835/)
+        => min_const_fn;
+    }
     Stable_1_33 {
         /// repr(packed(N)) ([PR](https://github.com/rust-lang/rust/pull/57049))
         => repr_packed_n;
diff --git a/tests/expectations/tests/bitfield-32bit-overflow.rs b/tests/expectations/tests/bitfield-32bit-overflow.rs
index 904a6ccc8d..361b0e3ae0 100644
--- a/tests/expectations/tests/bitfield-32bit-overflow.rs
+++ b/tests/expectations/tests/bitfield-32bit-overflow.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/bitfield-large.rs b/tests/expectations/tests/bitfield-large.rs
index 0e069b0130..6597e9672c 100644
--- a/tests/expectations/tests/bitfield-large.rs
+++ b/tests/expectations/tests/bitfield-large.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/bitfield-method-same-name.rs b/tests/expectations/tests/bitfield-method-same-name.rs
index bbb3ac60d1..a105f026b5 100644
--- a/tests/expectations/tests/bitfield-method-same-name.rs
+++ b/tests/expectations/tests/bitfield-method-same-name.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/bitfield_align.rs b/tests/expectations/tests/bitfield_align.rs
index e11751aab5..7fd1f2eb2a 100644
--- a/tests/expectations/tests/bitfield_align.rs
+++ b/tests/expectations/tests/bitfield_align.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/bitfield_align_2.rs b/tests/expectations/tests/bitfield_align_2.rs
index eb4e32b848..ee3cfea5e5 100644
--- a/tests/expectations/tests/bitfield_align_2.rs
+++ b/tests/expectations/tests/bitfield_align_2.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/bitfield_method_mangling.rs b/tests/expectations/tests/bitfield_method_mangling.rs
index e9887ce95f..9989bfe09e 100644
--- a/tests/expectations/tests/bitfield_method_mangling.rs
+++ b/tests/expectations/tests/bitfield_method_mangling.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/derive-bitfield-method-same-name.rs b/tests/expectations/tests/derive-bitfield-method-same-name.rs
index d00429cb62..abe57781a5 100644
--- a/tests/expectations/tests/derive-bitfield-method-same-name.rs
+++ b/tests/expectations/tests/derive-bitfield-method-same-name.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/derive-debug-bitfield-core.rs b/tests/expectations/tests/derive-debug-bitfield-core.rs
index 3f07d8ffc0..882bb9d632 100644
--- a/tests/expectations/tests/derive-debug-bitfield-core.rs
+++ b/tests/expectations/tests/derive-debug-bitfield-core.rs
@@ -17,7 +17,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/derive-debug-bitfield.rs b/tests/expectations/tests/derive-debug-bitfield.rs
index b9e14337c7..d72dd98772 100644
--- a/tests/expectations/tests/derive-debug-bitfield.rs
+++ b/tests/expectations/tests/derive-debug-bitfield.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/derive-partialeq-bitfield.rs b/tests/expectations/tests/derive-partialeq-bitfield.rs
index 857e0414c0..c183fc0f84 100644
--- a/tests/expectations/tests/derive-partialeq-bitfield.rs
+++ b/tests/expectations/tests/derive-partialeq-bitfield.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/divide-by-zero-in-struct-layout.rs b/tests/expectations/tests/divide-by-zero-in-struct-layout.rs
index a85c3930d4..fcfa962bdc 100644
--- a/tests/expectations/tests/divide-by-zero-in-struct-layout.rs
+++ b/tests/expectations/tests/divide-by-zero-in-struct-layout.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/issue-1034.rs b/tests/expectations/tests/issue-1034.rs
index db9ce77c47..4db46afe0d 100644
--- a/tests/expectations/tests/issue-1034.rs
+++ b/tests/expectations/tests/issue-1034.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/issue-1076-unnamed-bitfield-alignment.rs b/tests/expectations/tests/issue-1076-unnamed-bitfield-alignment.rs
index 6ec97f96b5..eef609a28d 100644
--- a/tests/expectations/tests/issue-1076-unnamed-bitfield-alignment.rs
+++ b/tests/expectations/tests/issue-1076-unnamed-bitfield-alignment.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/issue-739-pointer-wide-bitfield.rs b/tests/expectations/tests/issue-739-pointer-wide-bitfield.rs
index aae1cffa34..213b6812da 100644
--- a/tests/expectations/tests/issue-739-pointer-wide-bitfield.rs
+++ b/tests/expectations/tests/issue-739-pointer-wide-bitfield.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/issue-816.rs b/tests/expectations/tests/issue-816.rs
index 9fbfd9b399..e55bbb8ca0 100644
--- a/tests/expectations/tests/issue-816.rs
+++ b/tests/expectations/tests/issue-816.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/jsval_layout_opaque.rs b/tests/expectations/tests/jsval_layout_opaque.rs
index 491a6500ce..a2e8044748 100644
--- a/tests/expectations/tests/jsval_layout_opaque.rs
+++ b/tests/expectations/tests/jsval_layout_opaque.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/layout_align.rs b/tests/expectations/tests/layout_align.rs
index a6e3b8b8cd..c57e97423a 100644
--- a/tests/expectations/tests/layout_align.rs
+++ b/tests/expectations/tests/layout_align.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/layout_eth_conf.rs b/tests/expectations/tests/layout_eth_conf.rs
index 3c2d5f9b44..d3b22e8122 100644
--- a/tests/expectations/tests/layout_eth_conf.rs
+++ b/tests/expectations/tests/layout_eth_conf.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/layout_mbuf.rs b/tests/expectations/tests/layout_mbuf.rs
index cbb70d7a98..6f95065dd9 100644
--- a/tests/expectations/tests/layout_mbuf.rs
+++ b/tests/expectations/tests/layout_mbuf.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/only_bitfields.rs b/tests/expectations/tests/only_bitfields.rs
index f8f2c5de71..b5db31affd 100644
--- a/tests/expectations/tests/only_bitfields.rs
+++ b/tests/expectations/tests/only_bitfields.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/struct_with_bitfields.rs b/tests/expectations/tests/struct_with_bitfields.rs
index aff22429dd..3f99eb0268 100644
--- a/tests/expectations/tests/struct_with_bitfields.rs
+++ b/tests/expectations/tests/struct_with_bitfields.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/union_bitfield.rs b/tests/expectations/tests/union_bitfield.rs
index 0afc927084..3bcd9ba461 100644
--- a/tests/expectations/tests/union_bitfield.rs
+++ b/tests/expectations/tests/union_bitfield.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/union_with_anon_struct_bitfield.rs b/tests/expectations/tests/union_with_anon_struct_bitfield.rs
index c451219659..d8aaf22191 100644
--- a/tests/expectations/tests/union_with_anon_struct_bitfield.rs
+++ b/tests/expectations/tests/union_with_anon_struct_bitfield.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }
diff --git a/tests/expectations/tests/weird_bitfields.rs b/tests/expectations/tests/weird_bitfields.rs
index 7c2cc1bcab..a91aae684f 100644
--- a/tests/expectations/tests/weird_bitfields.rs
+++ b/tests/expectations/tests/weird_bitfields.rs
@@ -15,7 +15,7 @@ pub struct __BindgenBitfieldUnit<Storage, Align> {
 }
 impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
     #[inline]
-    pub fn new(storage: Storage) -> Self {
+    pub const fn new(storage: Storage) -> Self {
         Self { storage, align: [] }
     }
 }