Add 84455

Issue: rust-lang/rust#84455

Author: fanninpm

ices/84455.sh

@@ -0,0 +1,105 @@
+#!/bin/bash
+
+cat > Cargo.toml <<'EOF'
+[package]
+name = "abc"
+version = "0.0.1"
+edition = "2018"
+
+[profile.dev]
+panic = "abort"
+
+[profile.release]
+panic = "abort"
+EOF
+
+mkdir -p src
+
+cat > src/lib.rs <<'EOF'
+// ice_test
+#![no_std]
+
+#![feature(const_fn)]
+
+use core::alloc::{GlobalAlloc, Layout};
+
+pub static DEFAULT_ALLOCATOR: Allocator = Allocator::new(&DEFAULT_HEAP);
+static DEFAULT_HEAP: GeneralAllocator = GeneralAllocator::new();
+
+#[derive(Copy, Clone)]
+pub struct Allocator {
+    allocator: &'static (dyn GlobalAlloc + 'static),
+}
+
+unsafe impl Sync for Allocator {}
+
+impl Allocator {
+    const fn new(allocator: &'static dyn GlobalAlloc) -> Self {
+        Self { allocator }
+    }
+}
+
+unsafe impl GlobalAlloc for Allocator {
+    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
+        self.allocator.alloc(layout)
+    }
+    unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
+        self.allocator.dealloc(ptr, layout)
+    }
+}
+
+pub struct GeneralAllocator;
+
+unsafe impl Sync for GeneralAllocator {}
+
+impl GeneralAllocator {
+    pub const fn new() -> Self {
+        Self {}
+    }
+}
+
+unsafe impl GlobalAlloc for GeneralAllocator {
+    unsafe fn alloc(&self, _layout: Layout) -> *mut u8 {
+        todo!()
+    }
+
+    unsafe fn dealloc(&self, _ptr: *mut u8, _layout: Layout) {
+        todo!()
+    }
+}
+EOF
+
+cat > src/test.rs <<'EOF'
+#![feature(alloc_error_handler)]
+#![no_std]
+#![no_main]
+
+use ice_test::{Allocator, DEFAULT_ALLOCATOR};
+
+
+extern crate alloc;
+
+#[global_allocator]
+pub static GLOBAL_ALLOCATOR: Allocator = DEFAULT_ALLOCATOR;
+
+#[no_mangle]
+fn main() {
+
+}
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop {}
+}
+
+#[alloc_error_handler]
+fn alloc_error_handler(layout: core::alloc::Layout) -> ! {
+    panic!(
+        "Error allocating  {} bytes of memory with alignment {}",
+        layout.size(),
+        layout.align()
+    );
+}
+EOF
+
+cargo test