mirror of https://github.com/rust-lang/rust
74 lines
1.9 KiB
Rust
74 lines
1.9 KiB
Rust
#![feature(decl_macro)]
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#[derive(Copy, Clone, PartialEq, Debug)]
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pub enum Field {
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RootCtxt,
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MacroCtxt,
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}
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#[rustfmt::skip]
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macro x(
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$macro_name:ident,
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$macro2_name:ident,
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$type_name:ident,
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$field_name:ident,
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$const_name:ident
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) {
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#[derive(Copy, Clone)]
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pub struct $type_name {
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pub field: Field,
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pub $field_name: Field,
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}
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pub const $const_name: $type_name =
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$type_name { field: Field::MacroCtxt, $field_name: Field::RootCtxt };
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#[macro_export]
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macro_rules! $macro_name {
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(check_fields_of $e:expr) => {{
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let e = $e;
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assert_eq!(e.field, Field::MacroCtxt);
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assert_eq!(e.$field_name, Field::RootCtxt);
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}};
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(check_fields) => {{
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assert_eq!($const_name.field, Field::MacroCtxt);
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assert_eq!($const_name.$field_name, Field::RootCtxt);
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}};
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(construct) => {
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$type_name { field: Field::MacroCtxt, $field_name: Field::RootCtxt }
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};
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}
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pub macro $macro2_name {
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(check_fields_of $e:expr) => {{
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let e = $e;
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assert_eq!(e.field, Field::MacroCtxt);
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assert_eq!(e.$field_name, Field::RootCtxt);
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}},
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(check_fields) => {{
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assert_eq!($const_name.field, Field::MacroCtxt);
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assert_eq!($const_name.$field_name, Field::RootCtxt);
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}},
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(construct) => {
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$type_name { field: Field::MacroCtxt, $field_name: Field::RootCtxt }
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}
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}
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}
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x!(test_fields, test_fields2, MyStruct, field, MY_CONST);
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pub fn check_fields(s: MyStruct) {
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test_fields!(check_fields_of s);
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}
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pub fn check_fields_local() {
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test_fields!(check_fields);
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test_fields2!(check_fields);
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let s1 = test_fields!(construct);
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test_fields!(check_fields_of s1);
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let s2 = test_fields2!(construct);
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test_fields2!(check_fields_of s2);
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}
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