diff options
Diffstat (limited to 'compiler/rustc_builtin_macros/src/deriving/clone.rs')
| -rw-r--r-- | compiler/rustc_builtin_macros/src/deriving/clone.rs | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/compiler/rustc_builtin_macros/src/deriving/clone.rs b/compiler/rustc_builtin_macros/src/deriving/clone.rs index ef5a75f42..dfee2d3ce 100644 --- a/compiler/rustc_builtin_macros/src/deriving/clone.rs +++ b/compiler/rustc_builtin_macros/src/deriving/clone.rs @@ -6,7 +6,7 @@ use rustc_data_structures::fx::FxHashSet; use rustc_expand::base::{Annotatable, ExtCtxt}; use rustc_span::symbol::{kw, sym, Ident}; use rustc_span::Span; -use thin_vec::thin_vec; +use thin_vec::{thin_vec, ThinVec}; pub fn expand_deriving_clone( cx: &mut ExtCtxt<'_>, @@ -73,6 +73,7 @@ pub fn expand_deriving_clone( span, path: path_std!(clone::Clone), skip_path_as_bound: false, + needs_copy_as_bound_if_packed: true, additional_bounds: bounds, supports_unions: true, methods: vec![MethodDef { @@ -99,7 +100,7 @@ fn cs_clone_simple( substr: &Substructure<'_>, is_union: bool, ) -> BlockOrExpr { - let mut stmts = Vec::new(); + let mut stmts = ThinVec::new(); let mut seen_type_names = FxHashSet::default(); let mut process_variant = |variant: &VariantData| { for field in variant.fields() { @@ -161,7 +162,7 @@ fn cs_clone( let all_fields; let fn_path = cx.std_path(&[sym::clone, sym::Clone, sym::clone]); let subcall = |cx: &mut ExtCtxt<'_>, field: &FieldInfo| { - let args = vec![field.self_expr.clone()]; + let args = thin_vec![field.self_expr.clone()]; cx.expr_call_global(field.span, fn_path.clone(), args) }; @@ -199,7 +200,7 @@ fn cs_clone( let call = subcall(cx, field); cx.field_imm(field.span, ident, call) }) - .collect::<Vec<_>>(); + .collect::<ThinVec<_>>(); cx.expr_struct(trait_span, ctor_path, fields) } |