Rollup merge of rust-lang#125906 - compiler-errors:simplify-method-error-args, r=fmease

Remove a bunch of redundant args from `report_method_error`

Rebased on top of rust-lang#125397 because I had originally asked there (rust-lang#125397 (comment)) for this change to be made, but I just chose to do it myself.

r? fmease

Author: workingjubilee

compiler/rustc_hir_typeck/src/expr.rs

@@ -13,7 +13,6 @@ use crate::errors::{
     YieldExprOutsideOfCoroutine,
 };
 use crate::fatally_break_rust;
-use crate::method::SelfSource;
 use crate::type_error_struct;
 use crate::CoroutineTypes;
 use crate::Expectation::{self, ExpectCastableToType, ExpectHasType, NoExpectation};
@@ -223,7 +222,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         let ty = ensure_sufficient_stack(|| match &expr.kind {
             hir::ExprKind::Path(
                 qpath @ (hir::QPath::Resolved(..) | hir::QPath::TypeRelative(..)),
-            ) => self.check_expr_path(qpath, expr, args, call),
+            ) => self.check_expr_path(qpath, expr, Some(args), call),
             _ => self.check_expr_kind(expr, expected),
         });
         let ty = self.resolve_vars_if_possible(ty);
@@ -290,7 +289,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             ExprKind::Path(QPath::LangItem(lang_item, _)) => {
                 self.check_lang_item_path(lang_item, expr)
             }
-            ExprKind::Path(ref qpath) => self.check_expr_path(qpath, expr, &[], None),
+            ExprKind::Path(ref qpath) => self.check_expr_path(qpath, expr, None, None),
             ExprKind::InlineAsm(asm) => {
                 // We defer some asm checks as we may not have resolved the input and output types yet (they may still be infer vars).
                 self.deferred_asm_checks.borrow_mut().push((asm, expr.hir_id));
@@ -502,12 +501,12 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         &self,
         qpath: &'tcx hir::QPath<'tcx>,
         expr: &'tcx hir::Expr<'tcx>,
-        args: &'tcx [hir::Expr<'tcx>],
+        args: Option<&'tcx [hir::Expr<'tcx>]>,
         call: Option<&'tcx hir::Expr<'tcx>>,
     ) -> Ty<'tcx> {
         let tcx = self.tcx;
         let (res, opt_ty, segs) =
-            self.resolve_ty_and_res_fully_qualified_call(qpath, expr.hir_id, expr.span, Some(args));
+            self.resolve_ty_and_res_fully_qualified_call(qpath, expr.hir_id, expr.span);
         let ty = match res {
             Res::Err => {
                 self.suggest_assoc_method_call(segs);
@@ -564,7 +563,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     // We just want to check sizedness, so instead of introducing
                     // placeholder lifetimes with probing, we just replace higher lifetimes
                     // with fresh vars.
-                    let span = args.get(i).map(|a| a.span).unwrap_or(expr.span);
+                    let span = args.and_then(|args| args.get(i)).map_or(expr.span, |arg| arg.span);
                     let input = self.instantiate_binder_with_fresh_vars(
                         span,
                         infer::BoundRegionConversionTime::FnCall,
@@ -1331,9 +1330,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         let rcvr_t = self.check_expr(rcvr);
         // no need to check for bot/err -- callee does that
         let rcvr_t = self.structurally_resolve_type(rcvr.span, rcvr_t);
-        let span = segment.ident.span;
 
-        let method = match self.lookup_method(rcvr_t, segment, span, expr, rcvr, args) {
+        let method = match self.lookup_method(rcvr_t, segment, segment.ident.span, expr, rcvr, args)
+        {
             Ok(method) => {
                 // We could add a "consider `foo::<params>`" suggestion here, but I wasn't able to
                 // trigger this codepath causing `structurally_resolve_type` to emit an error.
@@ -1342,18 +1341,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
             Err(error) => {
                 if segment.ident.name != kw::Empty {
-                    if let Some(err) = self.report_method_error(
-                        span,
-                        Some(rcvr),
-                        rcvr_t,
-                        segment.ident,
-                        expr.hir_id,
-                        SelfSource::MethodCall(rcvr),
-                        error,
-                        Some(args),
-                        expected,
-                        false,
-                    ) {
+                    if let Some(err) =
+                        self.report_method_error(expr.hir_id, rcvr_t, error, expected, false)
+                    {
                         err.emit();
                     }
                 }
@@ -1362,7 +1352,14 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         };
 
         // Call the generic checker.
-        self.check_method_argument_types(span, expr, method, args, DontTupleArguments, expected)
+        self.check_method_argument_types(
+            segment.ident.span,
+            expr,
+            method,
+            args,
+            DontTupleArguments,
+            expected,
+        )
     }
 
     fn check_expr_cast(

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -1,6 +1,6 @@
 use crate::callee::{self, DeferredCallResolution};
 use crate::errors::{self, CtorIsPrivate};
-use crate::method::{self, MethodCallee, SelfSource};
+use crate::method::{self, MethodCallee};
 use crate::rvalue_scopes;
 use crate::{BreakableCtxt, Diverges, Expectation, FnCtxt, LoweredTy};
 use rustc_data_structures::fx::FxHashSet;
@@ -735,7 +735,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         qpath: &'tcx QPath<'tcx>,
         hir_id: HirId,
         span: Span,
-        args: Option<&'tcx [hir::Expr<'tcx>]>,
     ) -> (Res, Option<LoweredTy<'tcx>>, &'tcx [hir::PathSegment<'tcx>]) {
         debug!(
             "resolve_ty_and_res_fully_qualified_call: qpath={:?} hir_id={:?} span={:?}",
@@ -828,14 +827,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
                 if item_name.name != kw::Empty {
                     if let Some(e) = self.report_method_error(
-                        span,
-                        None,
-                        ty.normalized,
-                        item_name,
                         hir_id,
-                        SelfSource::QPath(qself),
+                        ty.normalized,
                         error,
-                        args,
                         Expectation::NoExpectation,
                         trait_missing_method && span.edition().at_least_rust_2021(), // emits missing method for trait only after edition 2021
                     ) {

compiler/rustc_hir_typeck/src/method/mod.rs

@@ -7,7 +7,6 @@ mod prelude_edition_lints;
 pub mod probe;
 mod suggest;
 
-pub use self::suggest::SelfSource;
 pub use self::MethodError::*;
 
 use crate::FnCtxt;

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -16,11 +16,11 @@ use rustc_data_structures::unord::UnordSet;
 use rustc_errors::{
     codes::*, pluralize, struct_span_code_err, Applicability, Diag, MultiSpan, StashKey,
 };
-use rustc_hir as hir;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::DefId;
 use rustc_hir::lang_items::LangItem;
 use rustc_hir::PathSegment;
+use rustc_hir::{self as hir, HirId};
 use rustc_hir::{ExprKind, Node, QPath};
 use rustc_infer::infer::{self, RegionVariableOrigin};
 use rustc_middle::bug;
@@ -187,37 +187,56 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     #[instrument(level = "debug", skip(self))]
     pub fn report_method_error(
         &self,
-        span: Span,
-        rcvr_opt: Option<&'tcx hir::Expr<'tcx>>,
+        call_id: HirId,
         rcvr_ty: Ty<'tcx>,
-        item_name: Ident,
-        expr_id: hir::HirId,
-        source: SelfSource<'tcx>,
         error: MethodError<'tcx>,
-        args: Option<&'tcx [hir::Expr<'tcx>]>,
         expected: Expectation<'tcx>,
         trait_missing_method: bool,
     ) -> Option<Diag<'_>> {
+        let (span, sugg_span, source, item_name, args) = match self.tcx.hir_node(call_id) {
+            hir::Node::Expr(&hir::Expr {
+                kind: hir::ExprKind::MethodCall(segment, rcvr, args, _),
+                span,
+                ..
+            }) => {
+                (segment.ident.span, span, SelfSource::MethodCall(rcvr), segment.ident, Some(args))
+            }
+            hir::Node::Expr(&hir::Expr {
+                kind: hir::ExprKind::Path(QPath::TypeRelative(rcvr, segment)),
+                span,
+                ..
+            })
+            | hir::Node::Pat(&hir::Pat {
+                kind:
+                    hir::PatKind::Path(QPath::TypeRelative(rcvr, segment))
+                    | hir::PatKind::Struct(QPath::TypeRelative(rcvr, segment), ..)
+                    | hir::PatKind::TupleStruct(QPath::TypeRelative(rcvr, segment), ..),
+                span,
+                ..
+            }) => {
+                let args = match self.tcx.parent_hir_node(call_id) {
+                    hir::Node::Expr(&hir::Expr {
+                        kind: hir::ExprKind::Call(callee, args), ..
+                    }) if callee.hir_id == call_id => Some(args),
+                    _ => None,
+                };
+                (segment.ident.span, span, SelfSource::QPath(rcvr), segment.ident, args)
+            }
+            node => unreachable!("{node:?}"),
+        };
+
         // Avoid suggestions when we don't know what's going on.
         if rcvr_ty.references_error() {
             return None;
         }
 
-        let sugg_span = if let SelfSource::MethodCall(expr) = source {
-            // Given `foo.bar(baz)`, `expr` is `bar`, but we want to point to the whole thing.
-            self.tcx.hir().expect_expr(self.tcx.parent_hir_id(expr.hir_id)).span
-        } else {
-            span
-        };
-
         match error {
             MethodError::NoMatch(mut no_match_data) => {
                 return self.report_no_match_method_error(
                     span,
-                    rcvr_opt,
                     rcvr_ty,
                     item_name,
-                    expr_id,
+                    call_id,
                     source,
                     args,
                     sugg_span,
@@ -362,7 +381,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     pub fn suggest_use_shadowed_binding_with_method(
         &self,
-        rcvr_opt: Option<&'tcx hir::Expr<'tcx>>,
+        self_source: SelfSource<'tcx>,
         method_name: Ident,
         ty_str_reported: &str,
         err: &mut Diag<'_>,
@@ -502,7 +521,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
         }
 
-        if let Some(rcvr) = rcvr_opt
+        if let SelfSource::MethodCall(rcvr) = self_source
             && let hir::ExprKind::Path(QPath::Resolved(_, path)) = rcvr.kind
             && let hir::def::Res::Local(recv_id) = path.res
             && let Some(segment) = path.segments.first()
@@ -548,7 +567,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     pub fn report_no_match_method_error(
         &self,
         mut span: Span,
-        rcvr_opt: Option<&'tcx hir::Expr<'tcx>>,
         rcvr_ty: Ty<'tcx>,
         item_name: Ident,
         expr_id: hir::HirId,
@@ -658,7 +676,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
             if is_method {
                 self.suggest_use_shadowed_binding_with_method(
-                    rcvr_opt,
+                    source,
                     item_name,
                     &ty_str_reported,
                     &mut err,

compiler/rustc_hir_typeck/src/pat.rs

@@ -223,9 +223,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         let PatInfo { binding_mode, max_ref_mutbl, top_info: ti, current_depth, .. } = pat_info;
 
         let path_res = match &pat.kind {
-            PatKind::Path(qpath) => Some(
-                self.resolve_ty_and_res_fully_qualified_call(qpath, pat.hir_id, pat.span, None),
-            ),
+            PatKind::Path(qpath) => {
+                Some(self.resolve_ty_and_res_fully_qualified_call(qpath, pat.hir_id, pat.span))
+            }
             _ => None,
         };
         let adjust_mode = self.calc_adjust_mode(pat, path_res.map(|(res, ..)| res));
@@ -1184,7 +1184,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         // Resolve the path and check the definition for errors.
         let (res, opt_ty, segments) =
-            self.resolve_ty_and_res_fully_qualified_call(qpath, pat.hir_id, pat.span, None);
+            self.resolve_ty_and_res_fully_qualified_call(qpath, pat.hir_id, pat.span);
         if res == Res::Err {
             let e = tcx.dcx().span_delayed_bug(pat.span, "`Res::Err` but no error emitted");
             self.set_tainted_by_errors(e);

tests/ui/issues/issue-28344.stderr

@@ -52,7 +52,7 @@ error[E0599]: no function or associated item named `bitor` found for trait objec
 LL |     let g = BitXor::bitor;
    |                     ^^^^^ function or associated item not found in `dyn BitXor<_>`
    |
-help: there is a method `bitxor` with a similar name, but with different arguments
+help: there is a method `bitxor` with a similar name
   --> $SRC_DIR/core/src/ops/bit.rs:LL:COL
 
 error: aborting due to 4 previous errors; 2 warnings emitted

tests/ui/resolve/issue-82865.stderr

@@ -15,13 +15,6 @@ LL |     Box::z
 LL |     mac!();
    |     ------ in this macro invocation
    |
-note: if you're trying to build a new `Box<_, _>` consider using one of the following associated functions:
-      Box::<T>::new
-      Box::<T>::new_uninit
-      Box::<T>::new_zeroed
-      Box::<T>::try_new
-      and 18 others
-  --> $SRC_DIR/alloc/src/boxed.rs:LL:COL
    = note: this error originates in the macro `mac` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 2 previous errors

tests/ui/traits/item-privacy.stderr

@@ -126,14 +126,15 @@ LL |     S::B;
    |        ^ associated item not found in `S`
    |
    = help: items from traits can only be used if the trait is in scope
+help: there is a method `b` with a similar name
+  --> $DIR/item-privacy.rs:11:9
+   |
+LL |         fn b(&self) { }
+   |         ^^^^^^^^^^^
 help: trait `B` which provides `B` is implemented but not in scope; perhaps you want to import it
    |
 LL + use assoc_const::B;
    |
-help: there is a method `b` with a similar name
-   |
-LL |     S::b;
-   |        ~
 
 error[E0624]: associated constant `A` is private
   --> $DIR/item-privacy.rs:101:14