From 2034697617b8e663fc95be4ac51308424ef0c874 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Fri, 14 Jun 2024 10:42:44 -0700
Subject: [PATCH] Invert core error cfg, until stable

---
 build.rs         | 6 +++---
 src/exception.rs | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/build.rs b/build.rs
index 3e5c29abd..3903b287c 100644
--- a/build.rs
+++ b/build.rs
@@ -32,7 +32,7 @@ fn main() {
             println!("cargo:rustc-check-cfg=cfg(compile_error_if_alloc)");
             println!("cargo:rustc-check-cfg=cfg(compile_error_if_std)");
             println!("cargo:rustc-check-cfg=cfg(cxx_experimental_no_alloc)");
-            println!("cargo:rustc-check-cfg=cfg(no_core_error)");
+            println!("cargo:rustc-check-cfg=cfg(error_in_core)");
             println!("cargo:rustc-check-cfg=cfg(no_core_ffi_c_char)");
             println!("cargo:rustc-check-cfg=cfg(skip_ui_tests)");
         }
@@ -50,9 +50,9 @@ fn main() {
             println!("cargo:rustc-cfg=no_core_ffi_c_char");
         }
 
-        if rustc.minor < 81 {
+        if rustc.minor >= 81 {
             // core::error::Error
-            println!("cargo:rustc-cfg=no_core_error");
+            println!("cargo:rustc-cfg=error_in_core");
         }
     }
 }
diff --git a/src/exception.rs b/src/exception.rs
index 182aa624d..9831f997f 100644
--- a/src/exception.rs
+++ b/src/exception.rs
@@ -3,9 +3,9 @@
 use alloc::boxed::Box;
 use core::fmt::{self, Display};
 
-#[cfg(not(no_core_error))]
+#[cfg(error_in_core)]
 use core::error::Error as StdError;
-#[cfg(all(feature = "std", no_core_error))]
+#[cfg(all(feature = "std", not(error_in_core)))]
 use std::error::Error as StdError;
 
 /// Exception thrown from an `extern "C++"` function.
@@ -21,7 +21,7 @@ impl Display for Exception {
     }
 }
 
-#[cfg(any(not(no_core_error), feature = "std"))]
+#[cfg(any(error_in_core, feature = "std"))]
 impl StdError for Exception {}
 
 impl Exception {