From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/test/mir-opt/simplify_try.rs | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 src/test/mir-opt/simplify_try.rs

(limited to 'src/test/mir-opt/simplify_try.rs')

diff --git a/src/test/mir-opt/simplify_try.rs b/src/test/mir-opt/simplify_try.rs
new file mode 100644
index 000000000..15e351e7d
--- /dev/null
+++ b/src/test/mir-opt/simplify_try.rs
@@ -0,0 +1,30 @@
+// compile-flags: -Zunsound-mir-opts
+// EMIT_MIR simplify_try.try_identity.SimplifyArmIdentity.diff
+// EMIT_MIR simplify_try.try_identity.SimplifyBranchSame.after.mir
+// EMIT_MIR simplify_try.try_identity.SimplifyLocals.after.mir
+// EMIT_MIR simplify_try.try_identity.DestinationPropagation.diff
+
+
+fn into_result<T, E>(r: Result<T, E>) -> Result<T, E> {
+    r
+}
+
+fn from_error<T, E>(e: E) -> Result<T, E> {
+    Err(e)
+}
+
+// This was written to the `?` from `try_trait`, but `try_trait_v2` uses a different structure,
+// so the relevant desugar is copied inline in order to keep the test testing the same thing.
+// FIXME(#85133): while this might be useful for `r#try!`, it would be nice to have a MIR
+// optimization that picks up the `?` desugaring, as `SimplifyArmIdentity` does not.
+fn try_identity(x: Result<u32, i32>) -> Result<u32, i32> {
+    let y = match into_result(x) {
+        Err(e) => return from_error(From::from(e)),
+        Ok(v) => v,
+    };
+    Ok(y)
+}
+
+fn main() {
+    let _ = try_identity(Ok(0));
+}
-- 
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