From 814827113e8cdffadb215de52fde349bace81610 Mon Sep 17 00:00:00 2001
From: Karim Snj <karim.snj@gmail.com>
Date: Tue, 6 Mar 2018 18:27:11 +0100
Subject: [PATCH] lint: immutable condition: add internally mutable test

---
 tests/ui/infinite_loop.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tests/ui/infinite_loop.rs b/tests/ui/infinite_loop.rs
index d86e6c042b3..cc694583eec 100644
--- a/tests/ui/infinite_loop.rs
+++ b/tests/ui/infinite_loop.rs
@@ -94,8 +94,22 @@ fn used_immutable() {
     }
 }
 
+use std::cell::Cell;
+
+fn maybe_i_mutate(i: &Cell<bool>) { unimplemented!() }
+
+fn internally_mutable() {
+    let b = Cell::new(true);
+
+    while b.get() {       // b cannot be silently coerced to `bool`
+        maybe_i_mutate(&b);
+        println!("OK - Method call within condition");
+    }
+}
+
 fn main() {
     immutable_condition();
     unused_var();
     used_immutable();
+    internally_mutable();
 }