diff --git a/compiler/rustc_builtin_macros/messages.ftl b/compiler/rustc_builtin_macros/messages.ftl
index dda466b026d91..bc2a9d5ad1e35 100644
--- a/compiler/rustc_builtin_macros/messages.ftl
+++ b/compiler/rustc_builtin_macros/messages.ftl
@@ -221,12 +221,6 @@ builtin_macros_requires_cfg_pattern =
     macro requires a cfg-pattern as an argument
     .label = cfg-pattern required
 
-builtin_macros_should_panic = functions using `#[should_panic]` must return `()`
-
-builtin_macros_test_arg_non_lifetime = functions used as tests can not have any non-lifetime generic parameters
-
-builtin_macros_test_args = functions used as tests can not have any arguments
-
 builtin_macros_test_bad_fn = {$kind} functions cannot be used for tests
     .label = `{$kind}` because of this
 
diff --git a/compiler/rustc_hir_analysis/messages.ftl b/compiler/rustc_hir_analysis/messages.ftl
index 89cd37e757fa2..e376411cd95c1 100644
--- a/compiler/rustc_hir_analysis/messages.ftl
+++ b/compiler/rustc_hir_analysis/messages.ftl
@@ -239,8 +239,6 @@ hir_analysis_missing_one_of_trait_item = not all trait items implemented, missin
     .label = missing one of `{$missing_items_msg}` in implementation
     .note = required because of this annotation
 
-hir_analysis_missing_tilde_const = missing `~const` qualifier for specialization
-
 hir_analysis_missing_trait_item = not all trait items implemented, missing: `{$missing_items_msg}`
     .label = missing `{$missing_items_msg}` in implementation
 
diff --git a/compiler/rustc_parse/messages.ftl b/compiler/rustc_parse/messages.ftl
index 55baf6f9f2eb0..60cc138fd7bc2 100644
--- a/compiler/rustc_parse/messages.ftl
+++ b/compiler/rustc_parse/messages.ftl
@@ -284,9 +284,6 @@ parse_found_expr_would_be_stmt = expected expression, found `{$token}`
 parse_function_body_equals_expr = function body cannot be `= expression;`
     .suggestion = surround the expression with `{"{"}` and `{"}"}` instead of `=` and `;`
 
-parse_gen_fn = `gen` functions are not yet implemented
-    .help = for now you can use `gen {"{}"}` blocks and return `impl Iterator` instead
-
 parse_generic_args_in_pat_require_turbofish_syntax = generic args in patterns require the turbofish syntax
 
 parse_generic_parameters_without_angle_brackets = generic parameters without surrounding angle brackets
diff --git a/compiler/rustc_resolve/messages.ftl b/compiler/rustc_resolve/messages.ftl
index 0747685c35c46..fa98338bbb6e8 100644
--- a/compiler/rustc_resolve/messages.ftl
+++ b/compiler/rustc_resolve/messages.ftl
@@ -8,10 +8,6 @@ resolve_add_as_non_derive =
 resolve_added_macro_use =
     have you added the `#[macro_use]` on the module/import?
 
-resolve_ampersand_used_without_explicit_lifetime_name =
-    `&` without an explicit lifetime name cannot be used here
-    .note = explicit lifetime name needed here
-
 resolve_ancestor_only =
     visibilities can only be restricted to ancestor modules
 
@@ -100,12 +96,6 @@ resolve_const_param_in_non_trivial_anon_const =
 resolve_const_param_in_ty_of_const_param =
     const parameters may not be used in the type of const parameters
 
-resolve_crate_may_not_be_imported =
-    `$crate` may not be imported
-
-resolve_crate_root_imports_must_be_named_explicitly =
-    crate root imports need to be explicitly named: `use crate as name;`
-
 resolve_expected_found =
     expected module, found {$res} `{$path_str}`
     .label = not a module
@@ -220,9 +210,6 @@ resolve_param_in_ty_of_const_param =
     the type of const parameters must not depend on other generic parameters
     .label = the type must not depend on the parameter `{$name}`
 
-resolve_parent_module_reset_for_binding =
-    parent module is reset for binding
-
 resolve_proc_macro_same_crate = can't use a procedural macro from the same crate that defines it
     .help = you can define integration tests in a directory named `tests`
 
@@ -270,11 +257,6 @@ resolve_trait_impl_duplicate =
     .old_span_label = previous definition here
     .trait_item_span = item in trait
 
-resolve_trait_impl_mismatch =
-    item `{$name}` is an associated {$kind}, which doesn't match its trait `{$trait_path}`
-    .label = does not match trait
-    .label_trait_item = item in trait
-
 resolve_try_using_similarly_named_label =
     try using similarly named label
 
@@ -295,10 +277,6 @@ resolve_undeclared_label =
     use of undeclared label `{$name}`
     .label = undeclared label `{$name}`
 
-resolve_underscore_lifetime_name_cannot_be_used_here =
-    `'_` cannot be used here
-    .note = `'_` is a reserved lifetime name
-
 resolve_unexpected_res_change_ty_to_const_param_sugg =
     you might have meant to write a const parameter here