Module syntax::feature_gateUnstable
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Feature gating
This modules implements the gating necessary for preventing certain compiler features from being used by default. This module will crawl a pre-expanded AST to ensure that there are no features which are used that are not enabled.
Features are enabled in programs via the crate-level attributes of
#![feature(...)] with a comma-separated list of features.
For the purpose of future feature-tracking, once code for detection of feature gate usage is added, do not remove it again even once the feature becomes stable.
Structs
| Features | A set of features to be used by later passes. |
Enums
| AttributeType |
Constants
| EXPLAIN_ASM | |
| EXPLAIN_CONCAT_IDENTS | |
| EXPLAIN_LOG_SYNTAX | |
| EXPLAIN_TRACE_MACROS |
Statics
| KNOWN_ATTRIBUTES |
Functions
| check_crate | |
| check_crate_macros | |
| emit_feature_err | |
| emit_feature_warn |