From 5bfc2568a21148c5c2dd9455e1720e4fc9021ed2 Mon Sep 17 00:00:00 2001
From: Jason Newcomb <jsnewcomb@pm.me>
Date: Sat, 17 Jul 2021 19:01:19 -0400
Subject: [PATCH] Fix ICE in `is_integer_const` when the expression is inside
 an `AnonConst` body

---
 clippy_utils/src/lib.rs      | 8 ++------
 tests/ui/crashes/ice-7340.rs | 6 ++++++
 2 files changed, 8 insertions(+), 6 deletions(-)
 create mode 100644 tests/ui/crashes/ice-7340.rs

diff --git a/clippy_utils/src/lib.rs b/clippy_utils/src/lib.rs
index 6db221ab0fd..9a9d6a20057 100644
--- a/clippy_utils/src/lib.rs
+++ b/clippy_utils/src/lib.rs
@@ -909,12 +909,8 @@ pub fn is_integer_const(cx: &LateContext<'_>, e: &Expr<'_>, value: u128) -> bool
     if is_integer_literal(e, value) {
         return true;
     }
-    let map = cx.tcx.hir();
-    let parent_item = map.get_parent_item(e.hir_id);
-    if let Some((Constant::Int(v), _)) = map
-        .maybe_body_owned_by(parent_item)
-        .and_then(|body_id| constant(cx, cx.tcx.typeck_body(body_id), e))
-    {
+    let enclosing_body = cx.tcx.hir().local_def_id(cx.tcx.hir().enclosing_body_owner(e.hir_id));
+    if let Some((Constant::Int(v), _)) = constant(cx, cx.tcx.typeck(enclosing_body), e) {
         value == v
     } else {
         false
diff --git a/tests/ui/crashes/ice-7340.rs b/tests/ui/crashes/ice-7340.rs
new file mode 100644
index 00000000000..7d2351d606f
--- /dev/null
+++ b/tests/ui/crashes/ice-7340.rs
@@ -0,0 +1,6 @@
+#![allow(clippy::no_effect)]
+
+fn main() {
+    const CONSTANT: usize = 8;
+    [1; 1 % CONSTANT];
+}