Auto merge of #108732 - Dylan-DPC:rollup-dy1l8sx, r=Dylan-DPC

Rollup of 6 pull requests

Successful merges:

 - #108298 (Fix ICE: check if snippet is `)`)
 - #108405 (Lazily compute crate name for consider_optimizing)
 - #108656 (Rustdoc search: Emit an error for unclosed generic)
 - #108660 (Remove ne implementations from strings)
 - #108669 (Allow checking whether a type allows being uninitialized)
 - #108727 (rustc_expand: make proc-macro derive error translatable)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_const_eval/src/interpret/intrinsics.rs

@@ -444,6 +444,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                             "aborted execution: attempted to leave type `{}` uninitialized, which is invalid",
                             ty
                         ),
+                        ValidityRequirement::Uninit => bug!("assert_uninit_valid doesn't exist"),
                     };
 
                     M::abort(self, msg)?;

compiler/rustc_const_eval/src/util/check_validity_requirement.rs

@@ -30,7 +30,7 @@ pub fn check_validity_requirement<'tcx>(
         return Ok(!layout.abi.is_uninhabited());
     }
 
-    if tcx.sess.opts.unstable_opts.strict_init_checks {
+    if kind == ValidityRequirement::Uninit || tcx.sess.opts.unstable_opts.strict_init_checks {
         might_permit_raw_init_strict(layout, tcx, kind)
     } else {
         let layout_cx = LayoutCx { tcx, param_env: param_env_and_ty.param_env };
@@ -99,6 +99,9 @@ fn might_permit_raw_init_lax<'tcx>(
                 }
                 s.valid_range(cx).contains(val)
             }
+            ValidityRequirement::Uninit => {
+                bug!("ValidityRequirement::Uninit should have been handled above")
+            }
         }
     };
 

compiler/rustc_expand/locales/en-US.ftl

@@ -133,3 +133,6 @@ expand_trace_macro = trace_macro
 expand_proc_macro_panicked =
     proc macro panicked
     .help = message: {$message}
+
+expand_proc_macro_derive_tokens =
+    proc-macro derive produced unparseable tokens

compiler/rustc_expand/src/errors.rs

@@ -390,3 +390,10 @@ pub(crate) struct ProcMacroPanicked {
 pub(crate) struct ProcMacroPanickedHelp {
     pub message: String,
 }
+
+#[derive(Diagnostic)]
+#[diag(expand_proc_macro_derive_tokens)]
+pub struct ProcMacroDeriveTokens {
+    #[primary_span]
+    pub span: Span,
+}

compiler/rustc_expand/src/proc_macro.rs

@@ -176,7 +176,7 @@ impl MultiItemModifier for DeriveProcMacro {
 
         // fail if there have been errors emitted
         if ecx.sess.parse_sess.span_diagnostic.err_count() > error_count_before {
-            ecx.struct_span_err(span, "proc-macro derive produced unparseable tokens").emit();
+            ecx.sess.emit_err(errors::ProcMacroDeriveTokens { span });
         }
 
         ExpandResult::Ready(items)

compiler/rustc_middle/src/ty/context.rs

@@ -794,8 +794,7 @@ impl<'tcx> TyCtxt<'tcx> {
     }
 
     pub fn consider_optimizing<T: Fn() -> String>(self, msg: T) -> bool {
-        let cname = self.crate_name(LOCAL_CRATE);
-        self.sess.consider_optimizing(cname.as_str(), msg)
+        self.sess.consider_optimizing(|| self.crate_name(LOCAL_CRATE), msg)
     }
 
     /// Obtain all lang items of this crate and all dependencies (recursively)

compiler/rustc_middle/src/ty/layout.rs

@@ -170,13 +170,17 @@ pub const FAT_PTR_EXTRA: usize = 1;
 /// * Cranelift stores the base-2 log of the lane count in a 4 bit integer.
 pub const MAX_SIMD_LANES: u64 = 1 << 0xF;
 
-/// Used in `might_permit_raw_init` to indicate the kind of initialisation
+/// Used in `check_validity_requirement` to indicate the kind of initialization
 /// that is checked to be valid
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, HashStable)]
 pub enum ValidityRequirement {
     Inhabited,
     Zero,
+    /// The return value of mem::uninitialized, 0x01
+    /// (unless -Zstrict-init-checks is on, in which case it's the same as Uninit).
     UninitMitigated0x01Fill,
+    /// True uninitialized memory.
+    Uninit,
 }
 
 impl ValidityRequirement {
@@ -196,6 +200,7 @@ impl fmt::Display for ValidityRequirement {
             Self::Inhabited => f.write_str("is inhabited"),
             Self::Zero => f.write_str("allows being left zeroed"),
             Self::UninitMitigated0x01Fill => f.write_str("allows being filled with 0x01"),
+            Self::Uninit => f.write_str("allows being left uninitialized"),
         }
     }
 }

compiler/rustc_parse/src/parser/expr.rs

@@ -1210,8 +1210,13 @@ impl<'a> Parser<'a> {
                         // `Enum::Foo { a: 3, b: 4 }` or `Enum::Foo(3, 4)`.
                         self.restore_snapshot(snapshot);
                         let close_paren = self.prev_token.span;
-                        let span = lo.to(self.prev_token.span);
-                        if !fields.is_empty() {
+                        let span = lo.to(close_paren);
+                        if !fields.is_empty() &&
+                            // `token.kind` should not be compared here.
+                            // This is because the `snapshot.token.kind` is treated as the same as
+                            // that of the open delim in `TokenTreesReader::parse_token_tree`, even if they are different.
+                            self.span_to_snippet(close_paren).map_or(false, |snippet| snippet == ")")
+                        {
                             let mut replacement_err = errors::ParenthesesWithStructFields {
                                 span,
                                 r#type: path,

compiler/rustc_session/src/session.rs

@@ -882,10 +882,14 @@ impl Session {
 
     /// We want to know if we're allowed to do an optimization for crate foo from -z fuel=foo=n.
     /// This expends fuel if applicable, and records fuel if applicable.
-    pub fn consider_optimizing<T: Fn() -> String>(&self, crate_name: &str, msg: T) -> bool {
+    pub fn consider_optimizing(
+        &self,
+        get_crate_name: impl Fn() -> Symbol,
+        msg: impl Fn() -> String,
+    ) -> bool {
         let mut ret = true;
         if let Some((ref c, _)) = self.opts.unstable_opts.fuel {
-            if c == crate_name {
+            if c == get_crate_name().as_str() {
                 assert_eq!(self.threads(), 1);
                 let mut fuel = self.optimization_fuel.lock();
                 ret = fuel.remaining != 0;
@@ -903,7 +907,7 @@ impl Session {
             }
         }
         if let Some(ref c) = self.opts.unstable_opts.print_fuel {
-            if c == crate_name {
+            if c == get_crate_name().as_str() {
                 assert_eq!(self.threads(), 1);
                 self.print_fuel.fetch_add(1, SeqCst);
             }

library/alloc/src/string.rs

@@ -2213,10 +2213,6 @@ impl PartialEq for String {
     fn eq(&self, other: &String) -> bool {
         PartialEq::eq(&self[..], &other[..])
     }
-    #[inline]
-    fn ne(&self, other: &String) -> bool {
-        PartialEq::ne(&self[..], &other[..])
-    }
 }
 
 macro_rules! impl_eq {