From a5fd955b9531e6cd6e8394ccf3a1f804ad227881 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9my=20Rakic?= <remy.rakic+github@gmail.com>
Date: Wed, 1 Sep 2021 18:33:34 +0200
Subject: [PATCH] add regression test for issue 83190

---
 src/test/ui/issues/issue-83190.rs | 49 +++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 src/test/ui/issues/issue-83190.rs

diff --git a/src/test/ui/issues/issue-83190.rs b/src/test/ui/issues/issue-83190.rs
new file mode 100644
index 0000000000000..da931c3edaf6f
--- /dev/null
+++ b/src/test/ui/issues/issue-83190.rs
@@ -0,0 +1,49 @@
+// check-pass
+
+// Regression test for issue #83190, triggering an ICE in borrowck.
+
+pub trait Any {}
+impl<T> Any for T {}
+
+pub trait StreamOnce {
+    type Range;
+}
+
+pub trait Parser<Input>: Sized {
+    type Output;
+    type PartialState;
+    fn map(self) -> Map<Self> {
+        todo!()
+    }
+}
+
+pub struct Map<P>(P);
+impl<I, P: Parser<I, Output = ()>> Parser<I> for Map<P> {
+    type Output = ();
+    type PartialState = P::PartialState;
+}
+
+struct TakeWhile1<Input>(Input);
+impl<I: StreamOnce> Parser<I> for TakeWhile1<I> {
+    type Output = I::Range;
+    type PartialState = ();
+}
+impl<I> TakeWhile1<I> {
+    fn new() -> Self {
+        todo!()
+    }
+}
+
+impl<I, A: Parser<I>> Parser<I> for (A,) {
+    type Output = ();
+    type PartialState = Map<A::Output>;
+}
+
+pub fn metric_stream_parser<'a, I>() -> impl Parser<I, Output = (), PartialState = impl Any + 'a>
+where
+    I: StreamOnce<Range = &'a [()]>,
+{
+    (TakeWhile1::new(),).map()
+}
+
+fn main() {}