diff --git a/Cargo.lock b/Cargo.lock
index ebacd32db4fc7..9d91dcde9b413 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4321,6 +4321,7 @@ dependencies = [
  "rustc_ast",
  "rustc_errors",
  "rustc_lint",
+ "rustc_macros",
  "rustc_metadata",
  "rustc_session",
  "rustc_span",
diff --git a/compiler/rustc_error_messages/locales/en-US/plugin_impl.ftl b/compiler/rustc_error_messages/locales/en-US/plugin_impl.ftl
new file mode 100644
index 0000000000000..8db32a42c1dea
--- /dev/null
+++ b/compiler/rustc_error_messages/locales/en-US/plugin_impl.ftl
@@ -0,0 +1,4 @@
+plugin_impl_load_plugin_error = {$msg}
+
+plugin_impl_malformed_plugin_attribute = malformed `plugin` attribute
+    .label = malformed attribute
diff --git a/compiler/rustc_error_messages/src/lib.rs b/compiler/rustc_error_messages/src/lib.rs
index 3569c7f063064..3e66d12bb37ec 100644
--- a/compiler/rustc_error_messages/src/lib.rs
+++ b/compiler/rustc_error_messages/src/lib.rs
@@ -41,6 +41,7 @@ fluent_messages! {
     lint => "../locales/en-US/lint.ftl",
     parser => "../locales/en-US/parser.ftl",
     passes => "../locales/en-US/passes.ftl",
+    plugin_impl => "../locales/en-US/plugin_impl.ftl",
     privacy => "../locales/en-US/privacy.ftl",
     typeck => "../locales/en-US/typeck.ftl",
 }
diff --git a/compiler/rustc_plugin_impl/Cargo.toml b/compiler/rustc_plugin_impl/Cargo.toml
index b6ea533c80bdd..c409b6c3e5440 100644
--- a/compiler/rustc_plugin_impl/Cargo.toml
+++ b/compiler/rustc_plugin_impl/Cargo.toml
@@ -11,6 +11,7 @@ doctest = false
 libloading = "0.7.1"
 rustc_errors = { path = "../rustc_errors" }
 rustc_lint = { path = "../rustc_lint" }
+rustc_macros = { path = "../rustc_macros" }
 rustc_metadata = { path = "../rustc_metadata" }
 rustc_ast = { path = "../rustc_ast" }
 rustc_session = { path = "../rustc_session" }
diff --git a/compiler/rustc_plugin_impl/src/errors.rs b/compiler/rustc_plugin_impl/src/errors.rs
new file mode 100644
index 0000000000000..2bdb6e4feca9d
--- /dev/null
+++ b/compiler/rustc_plugin_impl/src/errors.rs
@@ -0,0 +1,20 @@
+//! Errors emitted by plugin_impl
+
+use rustc_macros::SessionDiagnostic;
+use rustc_span::Span;
+
+#[derive(SessionDiagnostic)]
+#[diag(plugin_impl::load_plugin_error)]
+pub struct LoadPluginError {
+    #[primary_span]
+    pub span: Span,
+    pub msg: String,
+}
+
+#[derive(SessionDiagnostic)]
+#[diag(plugin_impl::malformed_plugin_attribute, code = "E0498")]
+pub struct MalformedPluginAttribute {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+}
diff --git a/compiler/rustc_plugin_impl/src/lib.rs b/compiler/rustc_plugin_impl/src/lib.rs
index 1195045bdea4a..9ac27c65da82e 100644
--- a/compiler/rustc_plugin_impl/src/lib.rs
+++ b/compiler/rustc_plugin_impl/src/lib.rs
@@ -8,9 +8,12 @@
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![recursion_limit = "256"]
+#![deny(rustc::untranslatable_diagnostic)]
+#![deny(rustc::diagnostic_outside_of_impl)]
 
 use rustc_lint::LintStore;
 
+mod errors;
 pub mod load;
 
 /// Structure used to register plugins.
diff --git a/compiler/rustc_plugin_impl/src/load.rs b/compiler/rustc_plugin_impl/src/load.rs
index 618682da4e597..8e75e969ae032 100644
--- a/compiler/rustc_plugin_impl/src/load.rs
+++ b/compiler/rustc_plugin_impl/src/load.rs
@@ -1,16 +1,14 @@
 //! Used by `rustc` when loading a plugin.
 
+use crate::errors::{LoadPluginError, MalformedPluginAttribute};
 use crate::Registry;
 use libloading::Library;
 use rustc_ast::Crate;
-use rustc_errors::struct_span_err;
 use rustc_metadata::locator;
 use rustc_session::cstore::MetadataLoader;
 use rustc_session::Session;
 use rustc_span::symbol::{sym, Ident};
-use rustc_span::Span;
 
-use std::borrow::ToOwned;
 use std::env;
 use std::mem;
 use std::path::PathBuf;
@@ -18,12 +16,6 @@ use std::path::PathBuf;
 /// Pointer to a registrar function.
 type PluginRegistrarFn = fn(&mut Registry<'_>);
 
-fn call_malformed_plugin_attribute(sess: &Session, span: Span) {
-    struct_span_err!(sess, span, E0498, "malformed `plugin` attribute")
-        .span_label(span, "malformed attribute")
-        .emit();
-}
-
 /// Read plugin metadata and dynamically load registrar functions.
 pub fn load_plugins(
     sess: &Session,
@@ -42,7 +34,9 @@ pub fn load_plugins(
                 Some(ident) if plugin.is_word() => {
                     load_plugin(&mut plugins, sess, metadata_loader, ident)
                 }
-                _ => call_malformed_plugin_attribute(sess, plugin.span()),
+                _ => {
+                    sess.emit_err(MalformedPluginAttribute { span: plugin.span() });
+                }
             }
         }
     }
@@ -60,7 +54,7 @@ fn load_plugin(
     let fun = dylink_registrar(lib).unwrap_or_else(|err| {
         // This is fatal: there are almost certainly macros we need inside this crate, so
         // continuing would spew "macro undefined" errors.
-        sess.span_fatal(ident.span, &err.to_string());
+        sess.emit_fatal(LoadPluginError { span: ident.span, msg: err.to_string() });
     });
     plugins.push(fun);
 }