Module rustc_span::hygiene

Machinery for hygienic macros.

Inspired by Matthew Flatt et al., “Macros That Work Together: Compile-Time Bindings, Partial Expansion, and Definition Contexts,” Journal of Functional Programming 22, no. 2 (March 1, 2012): 181–216, https://doi.org/10.1017/S0956796812000093.

Structs

ExpnData	A subset of properties from both macro definition and macro call available through global data. Avoid using this if you have access to the original definition or call structures.
ExpnId	A unique ID associated with a macro invocation and expansion.
HygieneData
HygieneDecodeContext	Additional information used to assist in decoding hygiene data
HygieneEncodeContext
SyntaxContext	A SyntaxContext represents a chain of pairs (ExpnId, Transparency) named “marks”.
SyntaxContextData

Enums

AstPass	The kind of AST transform.
DesugaringKind	The kind of compiler desugaring.
ExpnDataDecodeMode
ExpnDataEncodeMode
ExpnKind	Expansion kind.
ForLoopLoc	A location in the desugaring of a for loop
MacroKind	The kind of macro invocation or definition.
Transparency	A property of a macro expansion that determines how identifiers produced by that expansion are resolved.

Functions

clear_syntax_context_map
debug_hygiene_data
decode_expn_id
decode_syntax_context
for_all_ctxts_in
for_all_data
for_all_expn_data
for_all_expns_in
num_syntax_ctxts
raw_encode_expn_id
raw_encode_syntax_context
update_disambiguator	Updates the disambiguator field of the corresponding ExpnData such that the Fingerprint of the ExpnData does not collide with any other ExpnIds.
update_dollar_crate_names
walk_chain