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expand: Mark some dead code in derive expansion as unreachable

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This commit is contained in:
Vadim Petrochenkov 2020-11-19 01:55:59 +03:00
parent cd2177f3de
commit d575aa4d58
4 changed files with 5 additions and 54 deletions
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33
compiler/rustc_expand/src/proc_macro.rs
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@ -75,38 +75,9 @@ impl MultiItemModifier for ProcMacroDerive {
item: Annotatable,
) -> ExpandResult<Vec<Annotatable>, Annotatable> {
let item = match item {
Annotatable::Arm(..)
| Annotatable::Field(..)
| Annotatable::FieldPat(..)
| Annotatable::GenericParam(..)
| Annotatable::Param(..)
| Annotatable::StructField(..)
| Annotatable::Variant(..) => panic!("unexpected annotatable"),
Annotatable::Item(item) => item,
Annotatable::ImplItem(_)
| Annotatable::TraitItem(_)
| Annotatable::ForeignItem(_)
| Annotatable::Stmt(_)
| Annotatable::Expr(_) => {
ecx.span_err(
span,
"proc-macro derives may only be applied to a struct, enum, or union",
);
return ExpandResult::Ready(Vec::new());
}
Annotatable::Item(item) => token::NtItem(item),
_ => unreachable!(),
};
match item.kind {
ItemKind::Struct(..) | ItemKind::Enum(..) | ItemKind::Union(..) => {}
_ => {
ecx.span_err(
span,
"proc-macro derives may only be applied to a struct, enum, or union",
);
return ExpandResult::Ready(Vec::new());
}
}
let item = token::NtItem(item);
let input = if item.pretty_printing_compatibility_hack() {
TokenTree::token(token::Interpolated(Lrc::new(item)), DUMMY_SP).into()
} else {