diff --git a/compiler/rustc_resolve/src/build_reduced_graph.rs b/compiler/rustc_resolve/src/build_reduced_graph.rs
index ab4861a59df61..3f4c260a496af 100644
--- a/compiler/rustc_resolve/src/build_reduced_graph.rs
+++ b/compiler/rustc_resolve/src/build_reduced_graph.rs
@@ -32,7 +32,7 @@ use tracing::debug;
 
 use crate::Namespace::{MacroNS, TypeNS, ValueNS};
 use crate::def_collector::DefCollector;
-use crate::error_helper::{OnUnknownData, StructCtor};
+use crate::diagnostics::impls::{OnUnknownData, StructCtor};
 use crate::imports::{ImportData, ImportKind, NameResolution, NameResolutionRef};
 use crate::macros::{MacroRulesDecl, MacroRulesScope, MacroRulesScopeRef};
 use crate::ref_mut::CmCell;
diff --git a/compiler/rustc_resolve/src/error_helper.rs b/compiler/rustc_resolve/src/diagnostics/impls.rs
similarity index 100%
rename from compiler/rustc_resolve/src/error_helper.rs
rename to compiler/rustc_resolve/src/diagnostics/impls.rs
diff --git a/compiler/rustc_resolve/src/diagnostics.rs b/compiler/rustc_resolve/src/diagnostics/mod.rs
similarity index 99%
rename from compiler/rustc_resolve/src/diagnostics.rs
rename to compiler/rustc_resolve/src/diagnostics/mod.rs
index 3e2cb94dc2858..9de2a682dc1fd 100644
--- a/compiler/rustc_resolve/src/diagnostics.rs
+++ b/compiler/rustc_resolve/src/diagnostics/mod.rs
@@ -10,6 +10,8 @@ use rustc_span::{Ident, Span, Spanned, Symbol};
 use crate::Res;
 use crate::late::{PatternSource, ResolvingRestrictionKind};
 
+pub(crate) mod impls;
+
 #[derive(Diagnostic)]
 #[diag("can't use {$is_self ->
         [true] `Self`
diff --git a/compiler/rustc_resolve/src/imports.rs b/compiler/rustc_resolve/src/imports.rs
index 4daa549b1e109..d62bf538133f2 100644
--- a/compiler/rustc_resolve/src/imports.rs
+++ b/compiler/rustc_resolve/src/imports.rs
@@ -25,13 +25,13 @@ use rustc_span::{Ident, Span, Symbol, kw, sym};
 use tracing::debug;
 
 use crate::Namespace::{self, *};
+use crate::diagnostics::impls::{OnUnknownData, Suggestion};
 use crate::diagnostics::{
     self, CannotBeReexportedCratePublic, CannotBeReexportedCratePublicNS,
     CannotBeReexportedPrivate, CannotBeReexportedPrivateNS, CannotDetermineImportResolution,
     CannotGlobImportAllCrates, ConsiderAddingMacroExport, ConsiderMarkingAsPub,
     ConsiderMarkingAsPubCrate,
 };
-use crate::error_helper::{OnUnknownData, Suggestion};
 use crate::ref_mut::{CmCell, CmRefCell};
 use crate::{
     AmbiguityError, BindingKey, CmResolver, Decl, DeclData, DeclKind, Determinacy, Finalize,
diff --git a/compiler/rustc_resolve/src/late/diagnostics.rs b/compiler/rustc_resolve/src/late/diagnostics.rs
index 42ac352df6bfb..4874ccdcd460a 100644
--- a/compiler/rustc_resolve/src/late/diagnostics.rs
+++ b/compiler/rustc_resolve/src/late/diagnostics.rs
@@ -32,7 +32,7 @@ use thin_vec::{ThinVec, thin_vec};
 use tracing::debug;
 
 use super::NoConstantGenericsReason;
-use crate::error_helper::{ImportSuggestion, LabelSuggestion, TypoSuggestion};
+use crate::diagnostics::impls::{ImportSuggestion, LabelSuggestion, TypoSuggestion};
 use crate::late::{
     AliasPossibility, LateResolutionVisitor, LifetimeBinderKind, LifetimeRes, LifetimeRibKind,
     LifetimeUseSet, QSelf, RibKind,
diff --git a/compiler/rustc_resolve/src/lib.rs b/compiler/rustc_resolve/src/lib.rs
index 649d56fb11edf..13576c24e6c08 100644
--- a/compiler/rustc_resolve/src/lib.rs
+++ b/compiler/rustc_resolve/src/lib.rs
@@ -29,7 +29,6 @@ use std::{fmt, mem};
 
 use diagnostics::{ParamKindInEnumDiscriminant, ParamKindInNonTrivialAnonConst};
 use effective_visibilities::EffectiveVisibilitiesVisitor;
-use error_helper::{ImportSuggestion, LabelSuggestion, StructCtor, Suggestion};
 use hygiene::Macros20NormalizedSyntaxContext;
 use imports::{Import, ImportData, ImportKind, NameResolution, PendingDecl};
 use late::{
@@ -77,7 +76,9 @@ use rustc_span::{DUMMY_SP, Ident, Span, Symbol, kw, sym};
 use smallvec::{SmallVec, smallvec};
 use tracing::{debug, instrument};
 
-use crate::error_helper::OnUnknownData;
+use crate::diagnostics::impls::{
+    ImportSuggestion, LabelSuggestion, OnUnknownData, StructCtor, Suggestion,
+};
 use crate::imports::NameResolutionRef;
 use crate::ref_mut::{CmCell, CmRefCell};
 
@@ -86,7 +87,6 @@ mod check_unused;
 mod def_collector;
 mod diagnostics;
 mod effective_visibilities;
-mod error_helper;
 mod ident;
 mod imports;
 mod late;