Rollup merge of #64342 - glorv:master, r=varkor

factor out pluralisation remains after #64280

there are two case that doesn't not match the original macro pattern at [here](https://github.com/rust-lang/rust/blob/master/src/librustc_lint/unused.rs#L146) and [here](https://github.com/rust-lang/rust/blob/master/src/libsyntax/parse/diagnostics.rs#L539) as the provided param is already a bool or the check condition is not `x != 1`, so I change the macro accept a boolean expr instead of number to fit all the cases.

@Centril  please review

Fixes #64238.

2 files changed, 6 insertions, 7 deletions

diff --git a/src/libsyntax/parse/parser/path.rs b/src/libsyntax/parse/parser/path.rs
index d4b13cc2e01..dcd3c648017 100644
--- a/src/libsyntax/parse/parser/path.rs
+++ b/src/libsyntax/parse/parser/path.rs
@@ -9,7 +9,7 @@ use crate::symbol::kw;
 
 use std::mem;
 use log::debug;
-use errors::{Applicability};
+use errors::{Applicability, pluralise};
 
 /// Specifies how to parse a path.
 #[derive(Copy, Clone, PartialEq)]
@@ -347,20 +347,19 @@ impl<'a> Parser<'a> {
                 let span = lo.with_hi(
                     lo.lo() + BytePos(snapshot.unmatched_angle_bracket_count)
                 );
-                let plural = snapshot.unmatched_angle_bracket_count > 1;
                 self.diagnostic()
                     .struct_span_err(
                         span,
                         &format!(
                             "unmatched angle bracket{}",
-                            if plural { "s" } else { "" }
+                            pluralise!(snapshot.unmatched_angle_bracket_count)
                         ),
                     )
                     .span_suggestion(
                         span,
                         &format!(
                             "remove extra angle bracket{}",
-                            if plural { "s" } else { "" }
+                            pluralise!(snapshot.unmatched_angle_bracket_count)
                         ),
                         String::new(),
                         Applicability::MachineApplicable,
diff --git a/src/libsyntax/parse/parser/ty.rs b/src/libsyntax/parse/parser/ty.rs
index 465e31ac57e..5697edd8e48 100644
--- a/src/libsyntax/parse/parser/ty.rs
+++ b/src/libsyntax/parse/parser/ty.rs
@@ -11,7 +11,7 @@ use crate::symbol::{kw};
 
 use rustc_target::spec::abi::Abi;
 
-use errors::{Applicability};
+use errors::{Applicability, pluralise};
 
 /// Returns `true` if `IDENT t` can start a type -- `IDENT::a::b`, `IDENT<u8, u8>`,
 /// `IDENT<<u8 as Trait>::AssocTy>`.
@@ -397,7 +397,7 @@ impl<'a> Parser<'a> {
         }
 
         if !negative_bounds.is_empty() || was_negative {
-            let plural = negative_bounds.len() > 1;
+            let negative_bounds_len = negative_bounds.len();
             let last_span = negative_bounds.last().map(|sp| *sp);
             let mut err = self.struct_span_err(
                 negative_bounds,
@@ -420,7 +420,7 @@ impl<'a> Parser<'a> {
                 }
                 err.span_suggestion_hidden(
                     bound_list,
-                    &format!("remove the trait bound{}", if plural { "s" } else { "" }),
+                    &format!("remove the trait bound{}", pluralise!(negative_bounds_len)),
                     new_bound_list,
                     Applicability::MachineApplicable,
                 );