syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"//!"}]}
source_snippet: //! present, and if so we branch off into this module, which implements the attribute by
context_before: //! type checking like all other code. In MIR building we finally detect whether this attribute is
context_after: //! implementing a custom lowering from THIR to MIR.