Disarm time bomb (diagnostics)

Manually revert rust-lang#129343 `time` diagnostics, which is a temporary
diagnostic to mitigate inference breakage fallout.

Author: jieyouxu

compiler/rustc_span/src/symbol.rs

@@ -2099,7 +2099,6 @@ symbols! {
         three_way_compare,
         thumb2,
         thumb_mode: "thumb-mode",
-        time,
         tmm_reg,
         to_owned_method,
         to_string,

compiler/rustc_trait_selection/messages.ftl

@@ -452,8 +452,6 @@ trait_selection_type_annotations_needed = {$source_kind ->
 }
     .label = type must be known at this point
 
-trait_selection_type_annotations_needed_error_time = this is an inference error on crate `time` caused by an API change in Rust 1.80.0; update `time` to version `>=0.3.35` by calling `cargo update`
-
 trait_selection_types_declared_different = these two types are declared with different lifetimes...
 
 trait_selection_unable_to_construct_constant_value = unable to construct a constant value for the unevaluated constant {$unevaluated}

compiler/rustc_trait_selection/src/error_reporting/infer/need_type_info.rs

@@ -6,7 +6,7 @@ use rustc_errors::codes::*;
 use rustc_errors::{Diag, IntoDiagArg};
 use rustc_hir as hir;
 use rustc_hir::def::{CtorOf, DefKind, Namespace, Res};
-use rustc_hir::def_id::{DefId, LOCAL_CRATE, LocalDefId};
+use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::{Body, Closure, Expr, ExprKind, FnRetTy, HirId, LetStmt, LocalSource};
 use rustc_middle::bug;
@@ -17,7 +17,7 @@ use rustc_middle::ty::{
     self, GenericArg, GenericArgKind, GenericArgsRef, InferConst, IsSuggestable, Term, TermKind,
     Ty, TyCtxt, TypeFoldable, TypeFolder, TypeSuperFoldable, TypeVisitableExt, TypeckResults,
 };
-use rustc_span::{BytePos, DUMMY_SP, FileName, Ident, Span, sym};
+use rustc_span::{BytePos, DUMMY_SP, Ident, Span, sym};
 use tracing::{debug, instrument, warn};
 
 use super::nice_region_error::placeholder_error::Highlighted;
@@ -438,7 +438,6 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                 bad_label,
                 was_written: false,
                 path: Default::default(),
-                time_version: false,
             }),
             TypeAnnotationNeeded::E0283 => self.dcx().create_err(AmbiguousImpl {
                 span,
@@ -630,10 +629,6 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                 }
             }
         }
-
-        let time_version =
-            self.detect_old_time_crate_version(failure_span, &kind, &mut infer_subdiags);
-
         match error_code {
             TypeAnnotationNeeded::E0282 => self.dcx().create_err(AnnotationRequired {
                 span,
@@ -645,7 +640,6 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                 bad_label: None,
                 was_written: path.is_some(),
                 path: path.unwrap_or_default(),
-                time_version,
             }),
             TypeAnnotationNeeded::E0283 => self.dcx().create_err(AmbiguousImpl {
                 span,
@@ -671,42 +665,6 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
             }),
         }
     }
-
-    /// Detect the inference regression on crate `time` <= 0.3.35 and emit a more targeted error.
-    /// <https://github.com/rust-lang/rust/issues/127343>
-    // FIXME: we should figure out a more generic version of doing this, ideally in cargo itself.
-    fn detect_old_time_crate_version(
-        &self,
-        span: Option<Span>,
-        kind: &InferSourceKind<'_>,
-        // We will clear the non-actionable suggestion from the error to reduce noise.
-        infer_subdiags: &mut Vec<SourceKindSubdiag<'_>>,
-    ) -> bool {
-        // FIXME(#129461): We are time-boxing this code in the compiler. It'll start failing
-        // compilation once we promote 1.89 to beta, which will happen in 9 months from now.
-        #[cfg(not(version("1.89")))]
-        const fn version_check() {}
-        #[cfg(version("1.89"))]
-        const fn version_check() {
-            panic!("remove this check as presumably the ecosystem has moved from needing it");
-        }
-        const { version_check() };
-        // Only relevant when building the `time` crate.
-        if self.infcx.tcx.crate_name(LOCAL_CRATE) == sym::time
-            && let Some(span) = span
-            && let InferSourceKind::LetBinding { pattern_name, .. } = kind
-            && let Some(name) = pattern_name
-            && name.as_str() == "items"
-            && let FileName::Real(file) = self.infcx.tcx.sess.source_map().span_to_filename(span)
-        {
-            let path = file.local_path_if_available().to_string_lossy();
-            if path.contains("format_description") && path.contains("parse") {
-                infer_subdiags.clear();
-                return true;
-            }
-        }
-        false
-    }
 }
 
 #[derive(Debug)]

compiler/rustc_trait_selection/src/errors.rs

@@ -219,8 +219,6 @@ pub struct AnnotationRequired<'a> {
     #[note(trait_selection_full_type_written)]
     pub was_written: bool,
     pub path: PathBuf,
-    #[note(trait_selection_type_annotations_needed_error_time)]
-    pub time_version: bool,
 }
 
 // Copy of `AnnotationRequired` for E0283