// edition:2018
// check-pass
#![allow(unused)]
#![deny(rust_2021_prelude_collisions)]

struct S;

impl S {
    fn try_into(self) -> S {
        S
    }
}

struct X;

trait Hey {
    fn from_iter(_: i32) -> Self;
}

impl Hey for X {
    fn from_iter(_: i32) -> Self {
        X
    }
}

fn main() {
    // See https://github.com/rust-lang/rust/issues/86633
    let s = S;
    let s2 = s.try_into();

    // See https://github.com/rust-lang/rust/issues/86902
    X::from_iter(1);
}

// edition:2018
// check-pass
#![allow(unused)]
#![deny(rust_2021_prelude_collisions)]

struct S;

impl S {
    fn try_into(self) -> S {
        S
    }
}

// See https://github.com/rust-lang/rust/issues/86633
fn main() {
    let s = S;
    let s2 = s.try_into();
}

--- 
+++ 
@@ -11,8 +11,23 @@
     }
 }
 
-// See https://github.com/rust-lang/rust/issues/86633
+struct X;
+
+trait Hey {
+    fn from_iter(_: i32) -> Self;
+}
+
+impl Hey for X {
+    fn from_iter(_: i32) -> Self {
+        X
+    }
+}
+
 fn main() {
+    // See https://github.com/rust-lang/rust/issues/86633
     let s = S;
     let s2 = s.try_into();
+
+    // See https://github.com/rust-lang/rust/issues/86902
+    X::from_iter(1);
 }
Add test for trait check in prelude collision lint.
