rustc: Obsolete the `@` syntax entirely

This removes all remnants of `@` pointers from rustc. Additionally, this removes
the `GC` structure from the prelude as it seems odd exporting an experimental
type in the prelude by default.

Closes #14193
[breaking-change]

1 files changed, 16 insertions, 14 deletions

diff --git a/src/test/debuginfo/borrowed-managed-basic.rs b/src/test/debuginfo/borrowed-managed-basic.rs
index 85f32585905..0f81e530fdd 100644
--- a/src/test/debuginfo/borrowed-managed-basic.rs
+++ b/src/test/debuginfo/borrowed-managed-basic.rs
@@ -63,47 +63,49 @@
 
 #![allow(unused_variable)]
 
+use std::gc::{Gc, GC};
+
 fn main() {
-    let bool_box: @bool = @true;
+    let bool_box: Gc<bool> = box(GC) true;
     let bool_ref: &bool = bool_box;
 
-    let int_box: @int = @-1;
+    let int_box: Gc<int> = box(GC) -1;
     let int_ref: &int = int_box;
 
-    let char_box: @char = @'a';
+    let char_box: Gc<char> = box(GC) 'a';
     let char_ref: &char = char_box;
 
-    let i8_box: @i8 = @68;
+    let i8_box: Gc<i8> = box(GC) 68;
     let i8_ref: &i8 = i8_box;
 
-    let i16_box: @i16 = @-16;
+    let i16_box: Gc<i16> = box(GC) -16;
     let i16_ref: &i16 = i16_box;
 
-    let i32_box: @i32 = @-32;
+    let i32_box: Gc<i32> = box(GC) -32;
     let i32_ref: &i32 = i32_box;
 
-    let i64_box: @i64 = @-64;
+    let i64_box: Gc<i64> = box(GC) -64;
     let i64_ref: &i64 = i64_box;
 
-    let uint_box: @uint = @1;
+    let uint_box: Gc<uint> = box(GC) 1;
     let uint_ref: &uint = uint_box;
 
-    let u8_box: @u8 = @100;
+    let u8_box: Gc<u8> = box(GC) 100;
     let u8_ref: &u8 = u8_box;
 
-    let u16_box: @u16 = @16;
+    let u16_box: Gc<u16> = box(GC) 16;
     let u16_ref: &u16 = u16_box;
 
-    let u32_box: @u32 = @32;
+    let u32_box: Gc<u32> = box(GC) 32;
     let u32_ref: &u32 = u32_box;
 
-    let u64_box: @u64 = @64;
+    let u64_box: Gc<u64> = box(GC) 64;
     let u64_ref: &u64 = u64_box;
 
-    let f32_box: @f32 = @2.5;
+    let f32_box: Gc<f32> = box(GC) 2.5;
     let f32_ref: &f32 = f32_box;
 
-    let f64_box: @f64 = @3.5;
+    let f64_box: Gc<f64> = box(GC) 3.5;
     let f64_ref: &f64 = f64_box;
     zzz();
 }