Fix grammatical error in error message

Author: Sasha Pourcelot

compiler/rustc_parse/src/parser/mod.rs

@@ -885,7 +885,7 @@ impl<'a> Parser<'a> {
         }
 
         expect_err.set_primary_message(
-            "closure body that contain statements must be surrounded by braces",
+            "closure bodies that contain statements must be surrounded by braces",
         );
 
         let preceding_pipe_span = right_pipe_span;

src/test/ui/expr/malformed_closure/missing_braces_around_block.fixed

@@ -12,7 +12,7 @@
 fn main() {
     let num = 5;
     (1..num).reduce(|a, b| {
-        //~^ ERROR: closure body that contain statements must be surrounded by braces
+        //~^ ERROR: closure bodies that contain statements must be surrounded by braces
         println!("{}", a);
         a * b
     }).unwrap();

src/test/ui/expr/malformed_closure/missing_braces_around_block.rs

@@ -12,7 +12,7 @@
 fn main() {
     let num = 5;
     (1..num).reduce(|a, b|
-        //~^ ERROR: closure body that contain statements must be surrounded by braces
+        //~^ ERROR: closure bodies that contain statements must be surrounded by braces
         println!("{}", a);
         a * b
     ).unwrap();

src/test/ui/expr/malformed_closure/missing_braces_around_block.stderr

@@ -1,4 +1,4 @@
-error: closure body that contain statements must be surrounded by braces
+error: closure bodies that contain statements must be surrounded by braces
   --> $DIR/missing_braces_around_block.rs:14:26
    |
 LL |     (1..num).reduce(|a, b|