Rename diagnostic derive things.

For increased consistency.

- session_diagnostic_derive    -> diagnostic_derive
- session_subdiagnostic_derive -> subdiagnostic_derive
- SubdiagnosticDeriveBuilder   -> SubdiagnosticDerive

Author: nnethercote

Diff for: compiler/rustc_lint/src/internal.rs

@@ -352,8 +352,7 @@ declare_tool_lint! {
 declare_tool_lint! {
     /// The `diagnostic_outside_of_impl` lint detects calls to functions annotated with
     /// `#[rustc_lint_diagnostics]` that are outside an `Diagnostic`, `Subdiagnostic`, or
-    /// `LintDiagnostic` impl, or a `#[derive(Diagnostic)]`, `#[derive(Subdiagnostic)]`,
-    /// `#[derive(LintDiagnostic)]` expansion.
+    /// `LintDiagnostic` impl (either hand-written or derived).
     ///
     /// More details on diagnostics implementations can be found
     /// [here](https://rustc-dev-guide.rust-lang.org/diagnostics/diagnostic-structs.html).

Diff for: compiler/rustc_macros/src/diagnostics/mod.rs

@@ -6,7 +6,7 @@ mod utils;
 
 use diagnostic::{DiagnosticDerive, LintDiagnosticDerive};
 use proc_macro2::TokenStream;
-use subdiagnostic::SubdiagnosticDeriveBuilder;
+use subdiagnostic::SubdiagnosticDerive;
 use synstructure::Structure;
 
 /// Implements `#[derive(Diagnostic)]`, which allows for errors to be specified as a struct,
@@ -55,7 +55,7 @@ use synstructure::Structure;
 ///
 /// See rustc dev guide for more examples on using the `#[derive(Diagnostic)]`:
 /// <https://rustc-dev-guide.rust-lang.org/diagnostics/diagnostic-structs.html>
-pub fn session_diagnostic_derive(mut s: Structure<'_>) -> TokenStream {
+pub fn diagnostic_derive(mut s: Structure<'_>) -> TokenStream {
     s.underscore_const(true);
     DiagnosticDerive::new(s).into_tokens()
 }
@@ -153,7 +153,7 @@ pub fn lint_diagnostic_derive(mut s: Structure<'_>) -> TokenStream {
 ///
 /// diag.subdiagnostic(RawIdentifierSuggestion { span, applicability, ident });
 /// ```
-pub fn session_subdiagnostic_derive(mut s: Structure<'_>) -> TokenStream {
+pub fn subdiagnostic_derive(mut s: Structure<'_>) -> TokenStream {
     s.underscore_const(true);
-    SubdiagnosticDeriveBuilder::new().into_tokens(s)
+    SubdiagnosticDerive::new().into_tokens(s)
 }

Diff for: compiler/rustc_macros/src/diagnostics/subdiagnostic.rs

@@ -17,12 +17,12 @@ use synstructure::{BindingInfo, Structure, VariantInfo};
 use super::utils::SubdiagnosticVariant;
 
 /// The central struct for constructing the `add_to_diag` method from an annotated struct.
-pub(crate) struct SubdiagnosticDeriveBuilder {
+pub(crate) struct SubdiagnosticDerive {
     diag: syn::Ident,
     f: syn::Ident,
 }
 
-impl SubdiagnosticDeriveBuilder {
+impl SubdiagnosticDerive {
     pub(crate) fn new() -> Self {
         let diag = format_ident!("diag");
         let f = format_ident!("f");
@@ -109,7 +109,7 @@ impl SubdiagnosticDeriveBuilder {
 /// double mut borrow later on.
 struct SubdiagnosticDeriveVariantBuilder<'parent, 'a> {
     /// The identifier to use for the generated `Diag` instance.
-    parent: &'parent SubdiagnosticDeriveBuilder,
+    parent: &'parent SubdiagnosticDerive,
 
     /// Info for the current variant (or the type if not an enum).
     variant: &'a VariantInfo<'a>,

Diff for: compiler/rustc_macros/src/lib.rs

@@ -118,7 +118,7 @@ decl_derive!(
         suggestion,
         suggestion_short,
         suggestion_hidden,
-        suggestion_verbose)] => diagnostics::session_diagnostic_derive
+        suggestion_verbose)] => diagnostics::diagnostic_derive
 );
 decl_derive!(
     [LintDiagnostic, attributes(
@@ -156,5 +156,5 @@ decl_derive!(
         skip_arg,
         primary_span,
         suggestion_part,
-        applicability)] => diagnostics::session_subdiagnostic_derive
+        applicability)] => diagnostics::subdiagnostic_derive
 );