Struct rustc_parse::parser::attr_wrapper::AttrWrapper[][src]

pub struct AttrWrapper {
    attrs: AttrVec,
    start_pos: usize,
}
Expand description

A wrapper type to ensure that the parser handles outer attributes correctly. When we parse outer attributes, we need to ensure that we capture tokens for the attribute target. This allows us to perform cfg-expansion on a token stream before we invoke a derive proc-macro.

This wrapper prevents direct access to the underlying Vec<ast::Attribute>. Parsing code can only get access to the underlying attributes by passing an AttrWrapper to collect_tokens_trailing_tokens. This makes it difficult to accidentally construct an AST node (which stores a Vec<ast::Attribute>) without first collecting tokens.

This struct has its own module, to ensure that the parser code cannot directly access the attrs field

Fields

attrs: AttrVecstart_pos: usize

Implementations

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Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes