Commit b5a03c7

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Tell users not to file a bug when using internal library features

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Original file line number	Diff line number	Diff line change
`@@ -117,6 +117,12 @@ pub fn features(sess: &Session, krate_attrs: &[Attribute], crate_name: Symbol) -`
`117`	`117`	`// Otherwise, the feature is unknown. Record it as a lib feature.`
`118`	`118`	`// It will be checked later.`
`119`	`119`	`features.set_declared_lib_feature(name, mi.span());`
	`120`	`+`
	`121`	`+ // Similar to above, detect internal lib features to suppress`
	`122`	`+ // the ICE message that asks for a report.`
	`123`	`+ if features.internal(name) && ![sym::core, sym::alloc, sym::std].contains(&crate_name) {`
	`124`	`+ sess.using_internal_features.store(true, std::sync::atomic::Ordering::Relaxed);`
	`125`	`+ }`
`120`	`126`	`}`
`121`	`127`	`}`
`122`	`128`

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