diff --git a/clippy_lints/src/methods/mod.rs b/clippy_lints/src/methods/mod.rs
index 54a6a4cf934..acb8318970e 100644
--- a/clippy_lints/src/methods/mod.rs
+++ b/clippy_lints/src/methods/mod.rs
@@ -15,6 +15,7 @@ mod option_as_ref_deref;
 mod option_map_unwrap_or;
 mod skip_while_next;
 mod suspicious_map;
+mod uninit_assumed_init;
 mod unnecessary_filter_map;
 mod unnecessary_lazy_eval;
 mod unwrap_used;
@@ -1719,7 +1720,7 @@ impl<'tcx> LateLintPass<'tcx> for Methods {
                 filter_map_identity::check(cx, expr, arg_lists[0], method_spans[0]);
             },
             ["count", "map"] => suspicious_map::check(cx, expr),
-            ["assume_init"] => lint_maybe_uninit(cx, &arg_lists[0][0], expr),
+            ["assume_init"] => uninit_assumed_init::check(cx, &arg_lists[0][0], expr),
             ["unwrap_or", arith @ ("checked_add" | "checked_sub" | "checked_mul")] => {
                 manual_saturating_arithmetic::lint(cx, expr, &arg_lists, &arith["checked_".len()..])
             },
@@ -3548,34 +3549,6 @@ fn lint_into_iter(cx: &LateContext<'_>, expr: &hir::Expr<'_>, self_ref_ty: Ty<'_
     }
 }
 
-/// lint for `MaybeUninit::uninit().assume_init()` (we already have the latter)
-fn lint_maybe_uninit(cx: &LateContext<'_>, expr: &hir::Expr<'_>, outer: &hir::Expr<'_>) {
-    if_chain! {
-        if let hir::ExprKind::Call(ref callee, ref args) = expr.kind;
-        if args.is_empty();
-        if let hir::ExprKind::Path(ref path) = callee.kind;
-        if match_qpath(path, &paths::MEM_MAYBEUNINIT_UNINIT);
-        if !is_maybe_uninit_ty_valid(cx, cx.typeck_results().expr_ty_adjusted(outer));
-        then {
-            span_lint(
-                cx,
-                UNINIT_ASSUMED_INIT,
-                outer.span,
-                "this call for this type may be undefined behavior"
-            );
-        }
-    }
-}
-
-fn is_maybe_uninit_ty_valid(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
-    match ty.kind() {
-        ty::Array(ref component, _) => is_maybe_uninit_ty_valid(cx, component),
-        ty::Tuple(ref types) => types.types().all(|ty| is_maybe_uninit_ty_valid(cx, ty)),
-        ty::Adt(ref adt, _) => match_def_path(cx, adt.did, &paths::MEM_MAYBEUNINIT),
-        _ => false,
-    }
-}
-
 fn lint_map_collect(
     cx: &LateContext<'_>,
     expr: &hir::Expr<'_>,
diff --git a/clippy_lints/src/methods/uninit_assumed_init.rs b/clippy_lints/src/methods/uninit_assumed_init.rs
new file mode 100644
index 00000000000..798b66192c8
--- /dev/null
+++ b/clippy_lints/src/methods/uninit_assumed_init.rs
@@ -0,0 +1,35 @@
+use crate::utils::{match_def_path, match_qpath, paths, span_lint};
+use if_chain::if_chain;
+use rustc_hir as hir;
+use rustc_lint::LateContext;
+use rustc_middle::ty::{self, Ty};
+
+use super::UNINIT_ASSUMED_INIT;
+
+/// lint for `MaybeUninit::uninit().assume_init()` (we already have the latter)
+pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, outer: &hir::Expr<'_>) {
+    if_chain! {
+        if let hir::ExprKind::Call(ref callee, ref args) = expr.kind;
+        if args.is_empty();
+        if let hir::ExprKind::Path(ref path) = callee.kind;
+        if match_qpath(path, &paths::MEM_MAYBEUNINIT_UNINIT);
+        if !is_maybe_uninit_ty_valid(cx, cx.typeck_results().expr_ty_adjusted(outer));
+        then {
+            span_lint(
+                cx,
+                UNINIT_ASSUMED_INIT,
+                outer.span,
+                "this call for this type may be undefined behavior"
+            );
+        }
+    }
+}
+
+fn is_maybe_uninit_ty_valid(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
+    match ty.kind() {
+        ty::Array(ref component, _) => is_maybe_uninit_ty_valid(cx, component),
+        ty::Tuple(ref types) => types.types().all(|ty| is_maybe_uninit_ty_valid(cx, ty)),
+        ty::Adt(ref adt, _) => match_def_path(cx, adt.did, &paths::MEM_MAYBEUNINIT),
+        _ => false,
+    }
+}