Auto merge of #106111 - matthiaskrgr:rollup-nnpoe5h, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - #105465 (Improve top-level docs)
 - #105872 (Suggest remove last method call when type coerce with expected  type)
 - #106032 (std: only use LFS function on glibc)
 - #106078 (Provide more context on FileCheck failures)
 - #106100 (Codegen test for derived `<` on trivial newtype [TEST ONLY])
 - #106109 (rustdoc: make line number CSS for doc comment and scraped the same)

Failed merges:

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

2 files changed, 26 insertions, 0 deletions

diff --git a/compiler/rustc_hir_typeck/src/demand.rs b/compiler/rustc_hir_typeck/src/demand.rs
index e68bd1297c8..042ff0b46a5 100644
--- a/compiler/rustc_hir_typeck/src/demand.rs
+++ b/compiler/rustc_hir_typeck/src/demand.rs
@@ -38,6 +38,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         // Use `||` to give these suggestions a precedence
         let _ = self.suggest_missing_parentheses(err, expr)
+            || self.suggest_remove_last_method_call(err, expr, expected)
             || self.suggest_associated_const(err, expr, expected)
             || self.suggest_deref_ref_or_into(err, expr, expected, expr_ty, expected_ty_expr)
             || self.suggest_option_to_bool(err, expr, expr_ty, expected)
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
index efec0244633..9a7d753e66b 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
@@ -329,6 +329,31 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
+    pub fn suggest_remove_last_method_call(
+        &self,
+        err: &mut Diagnostic,
+        expr: &hir::Expr<'tcx>,
+        expected: Ty<'tcx>,
+    ) -> bool {
+        if let hir::ExprKind::MethodCall(hir::PathSegment { ident: method, .. }, recv_expr, &[], _) = expr.kind &&
+            let Some(recv_ty) = self.typeck_results.borrow().expr_ty_opt(recv_expr) &&
+            self.can_coerce(recv_ty, expected) {
+                let span = if let Some(recv_span) = recv_expr.span.find_ancestor_inside(expr.span) {
+                    expr.span.with_lo(recv_span.hi())
+                } else {
+                    expr.span.with_lo(method.span.lo() - rustc_span::BytePos(1))
+                };
+                err.span_suggestion_verbose(
+                    span,
+                    "try removing the method call",
+                    "",
+                    Applicability::MachineApplicable,
+                );
+                return true;
+            }
+        false
+    }
+
     pub fn suggest_deref_ref_or_into(
         &self,
         err: &mut Diagnostic,