From 5363f350887b1e5b5dd21a86f88c8af9d7fea6da Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:18:25 +0200
Subject: Merging upstream version 1.67.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../formal-and-expected-differ.rs                  | 25 ++++++++++++++++++
 .../formal-and-expected-differ.stderr              | 30 ++++++++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 src/test/ui/argument-suggestions/formal-and-expected-differ.rs
 create mode 100644 src/test/ui/argument-suggestions/formal-and-expected-differ.stderr

(limited to 'src/test/ui/argument-suggestions')

diff --git a/src/test/ui/argument-suggestions/formal-and-expected-differ.rs b/src/test/ui/argument-suggestions/formal-and-expected-differ.rs
new file mode 100644
index 000000000..5e3b55ca5
--- /dev/null
+++ b/src/test/ui/argument-suggestions/formal-and-expected-differ.rs
@@ -0,0 +1,25 @@
+pub trait Foo {
+    type T;
+}
+
+impl Foo for i32 {
+    type T = f32;
+}
+
+pub struct U<T1, T2>(T1, S<T2>)
+where
+    T1: Foo<T = T2>;
+
+pub struct S<T>(T);
+
+fn main() {
+    // The error message here isn't great -- it has to do with the fact that the
+    // `expected_inputs_for_expected_output` deduced inputs differs from the inputs
+    // that we infer from the constraints of the signature.
+    //
+    // I am not really sure what the best way of presenting this error message is,
+    // since right now it just suggests changing `3u32` <=> `3f32` back and forth.
+    let _: U<_, u32> = U(1, S(3u32));
+    //~^ ERROR mismatched types
+    //~| ERROR mismatched types
+}
diff --git a/src/test/ui/argument-suggestions/formal-and-expected-differ.stderr b/src/test/ui/argument-suggestions/formal-and-expected-differ.stderr
new file mode 100644
index 000000000..905875b52
--- /dev/null
+++ b/src/test/ui/argument-suggestions/formal-and-expected-differ.stderr
@@ -0,0 +1,30 @@
+error[E0308]: mismatched types
+  --> $DIR/formal-and-expected-differ.rs:22:29
+   |
+LL |     let _: U<_, u32> = U(1, S(3u32));
+   |                        -    ^^^^^^^ expected `f32`, found `u32`
+   |                        |
+   |                        arguments to this struct are incorrect
+   |
+   = note: expected struct `S<f32>`
+              found struct `S<u32>`
+note: tuple struct defined here
+  --> $DIR/formal-and-expected-differ.rs:9:12
+   |
+LL | pub struct U<T1, T2>(T1, S<T2>)
+   |            ^
+
+error[E0308]: mismatched types
+  --> $DIR/formal-and-expected-differ.rs:22:24
+   |
+LL |     let _: U<_, u32> = U(1, S(3u32));
+   |            ---------   ^^^^^^^^^^^^^ expected `u32`, found `f32`
+   |            |
+   |            expected due to this
+   |
+   = note: expected struct `U<_, u32>`
+              found struct `U<i32, f32>`
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0308`.
-- 
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