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Pretty printed the way Rust's parse_macro_input! parses a simple struct. Handy to know the full thing for pattern matching.
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| // rust has pretty print support for printing structures. this is how rust's proc_macros | |
| // parse the following struct: | |
| // | |
| // pub struct Book { | |
| // id: u64, | |
| // title: String, | |
| // pages: u64, | |
| // author: String, | |
| // } | |
| // | |
| // In this case, it was initialized like this: | |
| // | |
| // let b = Book { | |
| // id: 1728, | |
| // title: "My Story".to_string(), | |
| // pages: 1337, | |
| // author: "Jms Dnns".to_string(), | |
| // }; | |
| DeriveInput { | |
| attrs: [], | |
| vis: Visibility::Public( | |
| Pub, | |
| ), | |
| ident: Ident { | |
| ident: "Book", | |
| span: #0 bytes(78..82), | |
| }, | |
| generics: Generics { | |
| lt_token: None, | |
| params: [], | |
| gt_token: None, | |
| where_clause: None, | |
| }, | |
| data: Data::Struct { | |
| struct_token: Struct, | |
| fields: Fields::Named { | |
| brace_token: Brace, | |
| named: [ | |
| Field { | |
| attrs: [], | |
| vis: Visibility::Inherited, | |
| mutability: FieldMutability::None, | |
| ident: Some( | |
| Ident { | |
| ident: "id", | |
| span: #0 bytes(89..91), | |
| }, | |
| ), | |
| colon_token: Some( | |
| Colon, | |
| ), | |
| ty: Type::Path { | |
| qself: None, | |
| path: Path { | |
| leading_colon: None, | |
| segments: [ | |
| PathSegment { | |
| ident: Ident { | |
| ident: "u64", | |
| span: #0 bytes(93..96), | |
| }, | |
| arguments: PathArguments::None, | |
| }, | |
| ], | |
| }, | |
| }, | |
| }, | |
| Comma, | |
| Field { | |
| attrs: [], | |
| vis: Visibility::Inherited, | |
| mutability: FieldMutability::None, | |
| ident: Some( | |
| Ident { | |
| ident: "title", | |
| span: #0 bytes(102..107), | |
| }, | |
| ), | |
| colon_token: Some( | |
| Colon, | |
| ), | |
| ty: Type::Path { | |
| qself: None, | |
| path: Path { | |
| leading_colon: None, | |
| segments: [ | |
| PathSegment { | |
| ident: Ident { | |
| ident: "String", | |
| span: #0 bytes(109..115), | |
| }, | |
| arguments: PathArguments::None, | |
| }, | |
| ], | |
| }, | |
| }, | |
| }, | |
| Comma, | |
| Field { | |
| attrs: [], | |
| vis: Visibility::Inherited, | |
| mutability: FieldMutability::None, | |
| ident: Some( | |
| Ident { | |
| ident: "pages", | |
| span: #0 bytes(121..126), | |
| }, | |
| ), | |
| colon_token: Some( | |
| Colon, | |
| ), | |
| ty: Type::Path { | |
| qself: None, | |
| path: Path { | |
| leading_colon: None, | |
| segments: [ | |
| PathSegment { | |
| ident: Ident { | |
| ident: "u64", | |
| span: #0 bytes(128..131), | |
| }, | |
| arguments: PathArguments::None, | |
| }, | |
| ], | |
| }, | |
| }, | |
| }, | |
| Comma, | |
| Field { | |
| attrs: [], | |
| vis: Visibility::Inherited, | |
| mutability: FieldMutability::None, | |
| ident: Some( | |
| Ident { | |
| ident: "author", | |
| span: #0 bytes(137..143), | |
| }, | |
| ), | |
| colon_token: Some( | |
| Colon, | |
| ), | |
| ty: Type::Path { | |
| qself: None, | |
| path: Path { | |
| leading_colon: None, | |
| segments: [ | |
| PathSegment { | |
| ident: Ident { | |
| ident: "String", | |
| span: #0 bytes(145..151), | |
| }, | |
| arguments: PathArguments::None, | |
| }, | |
| ], | |
| }, | |
| }, | |
| }, | |
| Comma, | |
| ], | |
| }, | |
| semi_token: None, | |
| }, | |
| } |
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