From e1485202ac13d18e4b20e45b3dd02ced4dd8e778 Mon Sep 17 00:00:00 2001
From: Michael Goulet <michael@errs.io>
Date: Mon, 27 Feb 2023 05:23:26 +0000
Subject: [PATCH] Commit some new solver tests

---
 tests/ui/traits/new-solver/try-example.rs     | 28 +++++++++++++++++++
 .../equating-projection-cyclically.rs         | 24 ++++++++++++++++
 .../equating-projection-cyclically.stderr     | 14 ++++++++++
 3 files changed, 66 insertions(+)
 create mode 100644 tests/ui/traits/new-solver/try-example.rs
 create mode 100644 tests/ui/typeck/lazy-norm/equating-projection-cyclically.rs
 create mode 100644 tests/ui/typeck/lazy-norm/equating-projection-cyclically.stderr

diff --git a/tests/ui/traits/new-solver/try-example.rs b/tests/ui/traits/new-solver/try-example.rs
new file mode 100644
index 00000000000..e826f3a0059
--- /dev/null
+++ b/tests/ui/traits/new-solver/try-example.rs
@@ -0,0 +1,28 @@
+// check-pass
+// compile-flags: -Ztrait-solver=next
+
+use std::error::Error;
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let x: i32 = parse()?;
+    Ok(())
+}
+
+trait Parse {}
+
+impl Parse for i32 {}
+
+#[derive(Debug)]
+struct ParseError;
+
+impl std::fmt::Display for ParseError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "ParseError")
+    }
+}
+
+impl Error for ParseError {}
+
+fn parse<T: Parse>() -> Result<T, ParseError> {
+    todo!()
+}
diff --git a/tests/ui/typeck/lazy-norm/equating-projection-cyclically.rs b/tests/ui/typeck/lazy-norm/equating-projection-cyclically.rs
new file mode 100644
index 00000000000..019c6e81c50
--- /dev/null
+++ b/tests/ui/typeck/lazy-norm/equating-projection-cyclically.rs
@@ -0,0 +1,24 @@
+// compile-flags: -Ztrait-solver=next
+// known-bug: unknown
+
+trait Test {
+    type Assoc;
+}
+
+fn transform<T: Test>(x: T) -> T::Assoc {
+    todo!()
+}
+
+impl Test for i32 {
+    type Assoc = i32;
+}
+
+impl Test for String {
+    type Assoc = String;
+}
+
+fn main() {
+    let mut x = Default::default();
+    x = transform(x);
+    x = 1i32;
+}
diff --git a/tests/ui/typeck/lazy-norm/equating-projection-cyclically.stderr b/tests/ui/typeck/lazy-norm/equating-projection-cyclically.stderr
new file mode 100644
index 00000000000..57cbc65a17a
--- /dev/null
+++ b/tests/ui/typeck/lazy-norm/equating-projection-cyclically.stderr
@@ -0,0 +1,14 @@
+error[E0308]: mismatched types
+  --> $DIR/equating-projection-cyclically.rs:22:19
+   |
+LL |     x = transform(x);
+   |                   ^ expected inferred type, found associated type
+   |
+   = note:         expected type `_`
+           found associated type `<_ as Test>::Assoc`
+   = help: consider constraining the associated type `<_ as Test>::Assoc` to `_`
+   = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0308`.