Auto merge of #119972 - nnethercote:add-ErrCode, r=oli-obk

Add `ErrCode`

Error codes are integers, but `String` is used everywhere to represent them. Gross!

This commit introduces `ErrCode`, an integral newtype for error codes, replacing `String`. The commit also introduces constants like `E0123` for all the used error codes.

r? `@estebank`

1 files changed, 39 insertions, 0 deletions

diff --git a/compiler/rustc_errors/src/codes.rs b/compiler/rustc_errors/src/codes.rs
new file mode 100644
index 00000000000..947cf27ca79
--- /dev/null
+++ b/compiler/rustc_errors/src/codes.rs
@@ -0,0 +1,39 @@
+//! This module defines the following.
+//! - The `ErrCode` type.
+//! - A constant for every error code, with a name like `E0123`.
+//! - A static table `DIAGNOSTICS` pairing every error code constant with its
+//!   long description text.
+
+use std::fmt;
+
+rustc_index::newtype_index! {
+    #[max = 9999] // Because all error codes have four digits.
+    #[orderable]
+    #[encodable]
+    #[debug_format = "ErrCode({})"]
+    pub struct ErrCode {}
+}
+
+impl fmt::Display for ErrCode {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "E{:04}", self.as_u32())
+    }
+}
+
+macro_rules! define_error_code_constants_and_diagnostics_table {
+    ($($name:ident: $num:literal,)*) => (
+        $(
+            pub const $name: $crate::ErrCode = $crate::ErrCode::from_u32($num);
+        )*
+        pub static DIAGNOSTICS: &[($crate::ErrCode, &str)] = &[
+            $( (
+                $name,
+                include_str!(
+                    concat!("../../rustc_error_codes/src/error_codes/", stringify!($name), ".md")
+                )
+            ), )*
+        ];
+    )
+}
+
+rustc_error_codes::error_codes!(define_error_code_constants_and_diagnostics_table);