From cf4ac6b1e16e08ee7513ed03a323c6d00504beb2 Mon Sep 17 00:00:00 2001
From: Jane Lusby <jlusby@yaah.dev>
Date: Fri, 28 Jan 2022 14:07:27 -0800
Subject: [PATCH 1/2] Add From<u8> for ExitCode

This should cover a mostly cross-platform subset of supported exit codes.
---
 library/std/src/process.rs                         | 8 ++++++++
 library/std/src/sys/unix/process/process_common.rs | 6 ++++++
 library/std/src/sys/unsupported/process.rs         | 9 +++++++++
 library/std/src/sys/windows/process.rs             | 6 ++++++
 4 files changed, 29 insertions(+)

diff --git a/library/std/src/process.rs b/library/std/src/process.rs
index 7d7e08a7149..1f048905396 100644
--- a/library/std/src/process.rs
+++ b/library/std/src/process.rs
@@ -1691,6 +1691,14 @@ pub fn to_i32(self) -> i32 {
     }
 }
 
+#[unstable(feature = "process_exitcode_placeholder", issue = "48711")]
+impl From<u8> for ExitCode {
+    /// Construct an exit code from an arbitrary u8 value.
+    fn from(code: u8) -> Self {
+        ExitCode(imp::ExitCode::from(code))
+    }
+}
+
 impl Child {
     /// Forces the child process to exit. If the child has already exited, an [`InvalidInput`]
     /// error is returned.
diff --git a/library/std/src/sys/unix/process/process_common.rs b/library/std/src/sys/unix/process/process_common.rs
index 7ac2f9d8af7..97985ddd331 100644
--- a/library/std/src/sys/unix/process/process_common.rs
+++ b/library/std/src/sys/unix/process/process_common.rs
@@ -476,6 +476,12 @@ pub fn as_i32(&self) -> i32 {
     }
 }
 
+impl From<u8> for ExitCode {
+    fn from(code: u8) -> Self {
+        Self(code)
+    }
+}
+
 pub struct CommandArgs<'a> {
     iter: crate::slice::Iter<'a, CString>,
 }
diff --git a/library/std/src/sys/unsupported/process.rs b/library/std/src/sys/unsupported/process.rs
index 7846e43cfb5..deb58ffa8c7 100644
--- a/library/std/src/sys/unsupported/process.rs
+++ b/library/std/src/sys/unsupported/process.rs
@@ -162,6 +162,15 @@ pub fn as_i32(&self) -> i32 {
     }
 }
 
+impl From<u8> for ExitCode {
+    fn from(code: u8) -> Self {
+        match code {
+            0 => Self::SUCCESS,
+            1..255 => Self::FAILURE,
+        }
+    }
+}
+
 pub struct Process(!);
 
 impl Process {
diff --git a/library/std/src/sys/windows/process.rs b/library/std/src/sys/windows/process.rs
index 5ad57042797..f9e71951b2a 100644
--- a/library/std/src/sys/windows/process.rs
+++ b/library/std/src/sys/windows/process.rs
@@ -666,6 +666,12 @@ pub fn as_i32(&self) -> i32 {
     }
 }
 
+impl From<u8> for ExitCode {
+    fn from(code: u8) -> Self {
+        ExitCode(c::DWORD::from(code))
+    }
+}
+
 fn zeroed_startupinfo() -> c::STARTUPINFO {
     c::STARTUPINFO {
         cb: 0,

From 4c5a36e2d1ac0c5d86ba0a75426d601e7c9202b0 Mon Sep 17 00:00:00 2001
From: Jane Lusby <jlusby@yaah.dev>
Date: Mon, 7 Feb 2022 12:45:36 -0800
Subject: [PATCH 2/2] fix exclusive range error

---
 library/std/src/sys/unsupported/process.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/std/src/sys/unsupported/process.rs b/library/std/src/sys/unsupported/process.rs
index deb58ffa8c7..42a1ff730e3 100644
--- a/library/std/src/sys/unsupported/process.rs
+++ b/library/std/src/sys/unsupported/process.rs
@@ -166,7 +166,7 @@ impl From<u8> for ExitCode {
     fn from(code: u8) -> Self {
         match code {
             0 => Self::SUCCESS,
-            1..255 => Self::FAILURE,
+            1..=255 => Self::FAILURE,
         }
     }
 }