Fixed issue with large_enum_variant in no_std

Fixed issue #15192 by adding checks for no_std whild giving out Box recommendation

Author: lkshayb

clippy_lints/src/large_enum_variant.rs

@@ -10,6 +10,9 @@ use rustc_middle::ty::{self, Ty};
 use rustc_session::impl_lint_pass;
 use rustc_span::Span;
 
+
+
+
 declare_clippy_lint! {
     /// ### What it does
     /// Checks for large size differences between variants on
@@ -150,7 +153,10 @@ impl<'tcx> LateLintPass<'tcx> for LargeEnumVariant {
                                 return;
                             }
                         }
-                        diag.span_help(def.variants[variants_size[0].ind].span, help_text);
+                        if !is_no_std_crate(cx) {
+                            diag.span_help(def.variants[variants_size[0].ind].span, help_text);
+                        }
+                        
                     },
                 );
             }