[−][src]Module rustc_ap_syntax::feature_gate
Feature gating
This module 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
BUILTIN_ATTRIBUTE_MAP | |
Feature | |
Features | A set of features to be used by later passes. |
GatedCfg |
Enums
AttributeGate | |
AttributeType | |
GateIssue | |
Stability | |
State | |
UnstableFeatures |
Constants
BUILTIN_ATTRIBUTES | Attributes that have a special meaning to rustc or rustdoc. |
EXPLAIN_STMT_ATTR_SYNTAX | |
EXPLAIN_UNSIZED_TUPLE_COERCION | |
INCOMPLETE_FEATURES | Some features are known to be incomplete and using them is likely to have unanticipated results, such as compiler crashes. We warn the user about these to alert them. |
Functions
check_crate | |
deprecated_attributes | |
emit_feature_err | |
feature_err | |
get_features | |
is_builtin_attr | |
is_builtin_attr_name |
Type Definitions
BuiltinAttribute |