Rollup merge of #113334 - fmease:revert-lexing-c-str-lits, r=compiler-errors

Revert the lexing of `c"…"` string literals

Fixes \[after beta-backport\] #113235.
Further progress is tracked in #113333.

This PR *manually* reverts parts of #108801 (since a git-revert would've been too coarse-grained & messy)
and git-reverts #111647.

CC `@fee1-dead` (#108801) `@klensy` (#111647)
r? `@compiler-errors`

`@rustbot` label F-c_str_literals beta-nominated

1 files changed, 5 insertions, 4 deletions

diff --git a/library/std/src/sys/unix/process/process_common.rs b/library/std/src/sys/unix/process/process_common.rs
index 5f316b12b62..640648e8707 100644
--- a/library/std/src/sys/unix/process/process_common.rs
+++ b/library/std/src/sys/unix/process/process_common.rs
@@ -24,11 +24,11 @@ cfg_if::cfg_if! {
     if #[cfg(target_os = "fuchsia")] {
         // fuchsia doesn't have /dev/null
     } else if #[cfg(target_os = "redox")] {
-        const DEV_NULL: &CStr = c"null:";
+        const DEV_NULL: &str = "null:\0";
     } else if #[cfg(target_os = "vxworks")] {
-        const DEV_NULL: &CStr = c"/null";
+        const DEV_NULL: &str = "/null\0";
     } else {
-        const DEV_NULL: &CStr = c"/dev/null";
+        const DEV_NULL: &str = "/dev/null\0";
     }
 }
 
@@ -474,7 +474,8 @@ impl Stdio {
                 let mut opts = OpenOptions::new();
                 opts.read(readable);
                 opts.write(!readable);
-                let fd = File::open_c(DEV_NULL, &opts)?;
+                let path = unsafe { CStr::from_ptr(DEV_NULL.as_ptr() as *const _) };
+                let fd = File::open_c(&path, &opts)?;
                 Ok((ChildStdio::Owned(fd.into_inner()), None))
             }