Fix grammar in suggestion message

Author: Delta17920

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -1411,7 +1411,7 @@ impl<'ast, 'ra, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
 
                 err.span_suggestion_verbose(
                     pat.span,
-                    "if you meant to destructure a `Range`, use the struct pattern",
+                    "if you meant to destructure a `Range`, use a struct pattern",
                     format!("std::ops::Range {{ start: {}, end: {} }}", start_name, end_name),
                     Applicability::MaybeIncorrect,
                 );

tests/ui/resolve/suggest-range-struct-destructuring.stderr

@@ -4,7 +4,7 @@ error[E0425]: cannot find value `start` in this scope
 LL |     let start..end = r;
    |         ^^^^^ not found in this scope
    |
-help: if you meant to destructure a `Range`, use the struct pattern
+help: if you meant to destructure a `Range`, use a struct pattern
    |
 LL -     let start..end = r;
 LL +     let std::ops::Range { start: start, end: end } = r;
@@ -16,7 +16,7 @@ error[E0425]: cannot find value `end` in this scope
 LL |     let start..end = r;
    |                ^^^ not found in this scope
    |
-help: if you meant to destructure a `Range`, use the struct pattern
+help: if you meant to destructure a `Range`, use a struct pattern
    |
 LL -     let start..end = r;
 LL +     let std::ops::Range { start: start, end: end } = r;
@@ -31,7 +31,7 @@ LL |     let min..max = r;
 LL | fn main() {}
    | --------- similarly named function `main` defined here
    |
-help: if you meant to destructure a `Range`, use the struct pattern
+help: if you meant to destructure a `Range`, use a struct pattern
    |
 LL -     let min..max = r;
 LL +     let std::ops::Range { start: min, end: max } = r;
@@ -51,7 +51,7 @@ error[E0425]: cannot find value `max` in this scope
 LL |     let min..max = r;
    |              ^^^ not found in this scope
    |
-help: if you meant to destructure a `Range`, use the struct pattern
+help: if you meant to destructure a `Range`, use a struct pattern
    |
 LL -     let min..max = r;
 LL +     let std::ops::Range { start: min, end: max } = r;