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Some nightly features change the parser's behavior, it may accepts syntax that should be rejected when the feature is missing. But the complete list of enabled features can only be found once the parsing is complete. We should therefore not emit any error at parse time and instead collect a potential error and emit it later during the feature gating step. gcc/rust/ChangeLog: * checks/errors/feature/rust-feature-gate.cc (FeatureGate::check): Check all parse time errors. * checks/errors/feature/rust-feature-gate.h: Update function prototype with parse time errors. * parse/rust-parse-impl-attribute.hxx: Collect potential gating error with non literal attribute values. Remove error emission. * parse/rust-parse.h: Add a function to gather potential feature gating errors as well as a getter for collected errors. * rust-session-manager.cc (Session::compile_crate): Retrieve potential feature gating errors and check them later during the feature gating step. * util/rust-attributes.cc (check_export_name_attribute): Change attribute checking error emission to prevent errors with macro inputs. gcc/testsuite/ChangeLog: * rust/compile/doc_macro.rs: Enable feature to use a macro within an attribute input. * rust/compile/parse_time_feature_gate.rs: New test. Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
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