Module cfg 

The compiler code necessary to support the cfg! extension, which expands to a literal true or false based on whether the given cfg matches the current compilation environment.

Re-exports

use rustc_ast::tokenstream::TokenStream; 🔒

use rustc_ast::AttrStyle; 🔒

use rustc_ast::token; 🔒

use rustc_attr_ir::target::AstTarget; 🔒

use rustc_attr_ir::target::Target; 🔒

use rustc_attr_ir::AttrPath; 🔒

use rustc_attr_ir::CfgEntry; 🔒

use rustc_attr_parsing::parser::AllowExprMetavar; 🔒

use rustc_attr_parsing::parser::MetaItemOrLitParser; 🔒

use rustc_attr_parsing as attr; 🔒

use rustc_attr_parsing::AttributeParser; 🔒

use rustc_attr_parsing::AttributeSafety; 🔒

use rustc_attr_parsing::CFG_TEMPLATE; 🔒

use rustc_attr_parsing::ParsedDescription; 🔒

use rustc_attr_parsing::ShouldEmit; 🔒

use rustc_attr_parsing::parse_cfg_entry; 🔒

use rustc_expand::base::DummyResult; 🔒

use rustc_expand::base::ExpandResult; 🔒

use rustc_expand::base::ExtCtxt; 🔒

use rustc_expand::base::MacEager; 🔒

use rustc_expand::base::MacroExpanderResult; 🔒

use rustc_parse::exp; 🔒

use rustc_parse::parser::Recovery; 🔒

use rustc_span::ErrorGuaranteed; 🔒

use rustc_span::Span; 🔒

use rustc_span::sym; 🔒

use crate::diagnostics; 🔒

Functions

expand_cfg 🔒

parse_cfg 🔒