Rollup merge of #79005 - petrochenkov:noinjected, r=davidtwco

cleanup: Remove `ParseSess::injected_crate_name`

Its only remaining use is in pretty-printing where the necessary information can be easily re-computed.

Author: jonas-schievink

Diff for: compiler/rustc_ast_pretty/src/pprust/state.rs

@@ -109,7 +109,6 @@ pub fn print_crate<'a>(
     ann: &'a dyn PpAnn,
     is_expanded: bool,
     edition: Edition,
-    has_injected_crate: bool,
 ) -> String {
     let mut s = State {
         s: pp::mk_printer(),
@@ -119,7 +118,7 @@ pub fn print_crate<'a>(
         insert_extra_parens: true,
     };
 
-    if is_expanded && has_injected_crate {
+    if is_expanded && !krate.attrs.iter().any(|attr| attr.has_name(sym::no_core)) {
         // We need to print `#![no_std]` (and its feature gate) so that
         // compiling pretty-printed source won't inject libstd again.
         // However, we don't want these attributes in the AST because

Diff for: compiler/rustc_builtin_macros/src/standard_library_imports.rs

@@ -13,12 +13,12 @@ pub fn inject(
     resolver: &mut dyn ResolverExpand,
     sess: &Session,
     alt_std_name: Option<Symbol>,
-) -> (ast::Crate, Option<Symbol>) {
+) -> ast::Crate {
     let rust_2018 = sess.parse_sess.edition >= Edition::Edition2018;
 
     // the first name in this list is the crate name of the crate with the prelude
     let names: &[Symbol] = if sess.contains_name(&krate.attrs, sym::no_core) {
-        return (krate, None);
+        return krate;
     } else if sess.contains_name(&krate.attrs, sym::no_std) {
         if sess.contains_name(&krate.attrs, sym::compiler_builtins) {
             &[sym::core]
@@ -81,5 +81,5 @@ pub fn inject(
 
     krate.module.items.insert(0, use_item);
 
-    (krate, Some(name))
+    krate
 }

Diff for: compiler/rustc_driver/src/pretty.rs

@@ -404,7 +404,6 @@ pub fn print_after_parsing(
                 annotation.pp_ann(),
                 false,
                 parse.edition,
-                parse.injected_crate_name.get().is_some(),
             )
         })
     } else {
@@ -446,7 +445,6 @@ pub fn print_after_hir_lowering<'tcx>(
                     annotation.pp_ann(),
                     true,
                     parse.edition,
-                    parse.injected_crate_name.get().is_some(),
                 )
             })
         }

Diff for: compiler/rustc_interface/src/passes.rs

@@ -239,16 +239,12 @@ fn configure_and_expand_inner<'a>(
 
     krate = sess.time("crate_injection", || {
         let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));
-        let (krate, name) = rustc_builtin_macros::standard_library_imports::inject(
+        rustc_builtin_macros::standard_library_imports::inject(
             krate,
             &mut resolver,
             &sess,
             alt_std_name,
-        );
-        if let Some(name) = name {
-            sess.parse_sess.injected_crate_name.set(name).expect("not yet initialized");
-        }
-        krate
+        )
     });
 
     util::check_attr_crate_type(&sess, &krate.attrs, &mut resolver.lint_buffer());

Diff for: compiler/rustc_session/src/parse.rs

@@ -4,7 +4,7 @@
 use crate::lint::{BufferedEarlyLint, BuiltinLintDiagnostics, Lint, LintId};
 use rustc_ast::node_id::NodeId;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
-use rustc_data_structures::sync::{Lock, Lrc, OnceCell};
+use rustc_data_structures::sync::{Lock, Lrc};
 use rustc_errors::{emitter::SilentEmitter, ColorConfig, Handler};
 use rustc_errors::{error_code, Applicability, DiagnosticBuilder};
 use rustc_feature::{find_feature_issue, GateIssue, UnstableFeatures};
@@ -129,7 +129,6 @@ pub struct ParseSess {
     /// operation token that followed it, but that the parser cannot identify without further
     /// analysis.
     pub ambiguous_block_expr_parse: Lock<FxHashMap<Span, Span>>,
-    pub injected_crate_name: OnceCell<Symbol>,
     pub gated_spans: GatedSpans,
     pub symbol_gallery: SymbolGallery,
     /// The parser has reached `Eof` due to an unclosed brace. Used to silence unnecessary errors.
@@ -158,7 +157,6 @@ impl ParseSess {
             source_map,
             buffered_lints: Lock::new(vec![]),
             ambiguous_block_expr_parse: Lock::new(FxHashMap::default()),
-            injected_crate_name: OnceCell::new(),
             gated_spans: GatedSpans::default(),
             symbol_gallery: SymbolGallery::default(),
             reached_eof: Lock::new(false),