diff --git a/compiler/rustc_ast_lowering/messages.ftl b/compiler/rustc_ast_lowering/messages.ftl
index f63a9bfcd70..8115c4b55b0 100644
--- a/compiler/rustc_ast_lowering/messages.ftl
+++ b/compiler/rustc_ast_lowering/messages.ftl
@@ -29,10 +29,6 @@ ast_lowering_bad_return_type_notation_inputs =
     argument types not allowed with return type notation
     .suggestion = remove the input types
 
-ast_lowering_bad_return_type_notation_needs_dots =
-    return type notation arguments must be elided with `..`
-    .suggestion = add `..`
-
 ast_lowering_bad_return_type_notation_output =
     return type not allowed with return type notation
     .suggestion = remove the return type
diff --git a/compiler/rustc_borrowck/messages.ftl b/compiler/rustc_borrowck/messages.ftl
index d8ca62565fa..2c7b97afa80 100644
--- a/compiler/rustc_borrowck/messages.ftl
+++ b/compiler/rustc_borrowck/messages.ftl
@@ -74,9 +74,6 @@ borrowck_higher_ranked_subtype_error =
 borrowck_lifetime_constraints_error =
     lifetime may not live long enough
 
-borrowck_move_borrowed =
-    cannot move out of `{$desc}` because it is borrowed
-
 borrowck_move_out_place_here =
     {$place} is moved here
 
@@ -250,12 +247,6 @@ borrowck_var_move_by_use_in_closure =
 borrowck_var_move_by_use_in_generator =
     move occurs due to use in generator
 
-borrowck_var_move_by_use_place_in_closure =
-    move occurs due to use of {$place} in closure
-
-borrowck_var_move_by_use_place_in_generator =
-    move occurs due to use of {$place} in generator
-
 borrowck_var_mutable_borrow_by_use_place_in_closure =
     mutable borrow occurs due to use of {$place} in closure
 
diff --git a/compiler/rustc_metadata/messages.ftl b/compiler/rustc_metadata/messages.ftl
index cc58d51befd..633004fdddf 100644
--- a/compiler/rustc_metadata/messages.ftl
+++ b/compiler/rustc_metadata/messages.ftl
@@ -259,9 +259,6 @@ metadata_std_required =
 metadata_symbol_conflicts_current =
     the current crate is indistinguishable from one of its dependencies: it has the same crate-name `{$crate_name}` and was compiled with the same `-C metadata` arguments. This will result in symbol conflicts between the two.
 
-metadata_symbol_conflicts_others =
-    found two different crates with name `{$crate_name}` that are not distinguished by differing `-C metadata`. This will result in symbol conflicts between the two.
-
 metadata_target_no_std_support =
     the `{$locator_triple}` target may not support the standard library
 
diff --git a/compiler/rustc_passes/messages.ftl b/compiler/rustc_passes/messages.ftl
index 9f3cd656bd1..eb1e1269f7f 100644
--- a/compiler/rustc_passes/messages.ftl
+++ b/compiler/rustc_passes/messages.ftl
@@ -104,10 +104,6 @@ passes_collapse_debuginfo =
 passes_confusables = attribute should be applied to an inherent method
     .label = not an inherent method
 
-passes_const_impl_const_trait =
-    const `impl`s must be for traits marked with `#[const_trait]`
-    .note = this trait must be annotated with `#[const_trait]`
-
 passes_continue_labeled_block =
     `continue` pointing to a labeled block
     .label = labeled blocks cannot be `continue`'d