diff --git a/impl/src/error.rs b/impl/src/error.rs
index a801dc20..5ee3d887 100644
--- a/impl/src/error.rs
+++ b/impl/src/error.rs
@@ -40,7 +40,7 @@ pub fn expand(
         // Not using `#[inline]` here on purpose, since this is almost never part
         // of a hot codepath.
         quote! {
-            fn source(&self) -> Option<&(dyn derive_more::core::error::Error + 'static)> {
+            fn source(&self) -> derive_more::core::option::Option<&(dyn derive_more::core::error::Error + 'static)> {
                 use derive_more::__private::AsDynError as _;
                 #source
             }
@@ -166,7 +166,10 @@ fn render_enum(
         })
     };
 
-    let source = render(&mut source_match_arms, quote! { None });
+    let source = render(
+        &mut source_match_arms,
+        quote! { derive_more::core::option::Option::None },
+    );
     let provide = render(&mut provide_match_arms, quote! { () });
 
     Ok((bounds, source, provide))
@@ -287,7 +290,7 @@ fn render_some(mut expr: TokenStream, unpack: bool) -> TokenStream {
     if unpack {
         expr = quote! { derive_more::core::option::Option::as_ref(#expr)? }
     }
-    quote! { Some(#expr.__derive_more_as_dyn_error()) }
+    quote! { derive_more::core::option::Option::Some(#expr.__derive_more_as_dyn_error()) }
 }
 
 fn parse_fields<'input, 'state>(
diff --git a/impl/src/is_variant.rs b/impl/src/is_variant.rs
index 4ca7ebbb..d04a23b2 100644
--- a/impl/src/is_variant.rs
+++ b/impl/src/is_variant.rs
@@ -41,7 +41,7 @@ pub fn expand(input: &DeriveInput, trait_name: &'static str) -> Result<TokenStre
         };
         let func = quote! {
             #[doc = "Returns `true` if this value is of type `"]
-            #[doc = stringify!(#variant_ident)]
+            #[doc = derive_more::core::stringify!(#variant_ident)]
             #[doc = "`. Returns `false` otherwise"]
             #[inline]
             #[must_use]
diff --git a/impl/src/try_unwrap.rs b/impl/src/try_unwrap.rs
index efa11369..1782cc93 100644
--- a/impl/src/try_unwrap.rs
+++ b/impl/src/try_unwrap.rs
@@ -165,9 +165,9 @@ fn failed_block(state: &State, enum_name: &Ident, func_name: &Ident) -> TokenStr
             let error = quote! {
                 derive_more::TryUnwrapError::<_>::new(
                     val,
-                    stringify!(#enum_name),
-                    stringify!(#variant_ident),
-                    stringify!(#func_name),
+                    derive_more::core::stringify!(#enum_name),
+                    derive_more::core::stringify!(#variant_ident),
+                    derive_more::core::stringify!(#func_name),
                 )
             };
             quote! {
diff --git a/impl/src/unwrap.rs b/impl/src/unwrap.rs
index 2df7732b..294ad96b 100644
--- a/impl/src/unwrap.rs
+++ b/impl/src/unwrap.rs
@@ -160,7 +160,7 @@ fn failed_block(state: &State, enum_name: &Ident, fn_name: &Ident) -> TokenStrea
             let panic_msg = format!(
                 "called `{enum_name}::{fn_name}()` on a `{enum_name}::{variant_ident}` value"
             );
-            quote! { #enum_name :: #variant_ident #data_pattern => panic!(#panic_msg) }
+            quote! { #enum_name :: #variant_ident #data_pattern => derive_more::core::panic!(#panic_msg) }
         });
 
     quote! {
diff --git a/tests/compile_fail/eq/non_eq_field.stderr b/tests/compile_fail/eq/non_eq_field.stderr
index ae02e14a..e93c539b 100644
--- a/tests/compile_fail/eq/non_eq_field.stderr
+++ b/tests/compile_fail/eq/non_eq_field.stderr
@@ -14,5 +14,4 @@ error[E0277]: the trait bound `f32: Eq` is not satisfied
             u128
             u16
           and $N others
-  = help: see issue #48214
   = note: this error originates in the derive macro `derive_more::Eq` (in Nightly builds, run with -Z macro-backtrace for more info)