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Avoid repetition on “use of unstable library feature 'rustc_private'” #45540

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Merged
merged 4 commits into from
Oct 28, 2017
Merged

Avoid repetition on “use of unstable library feature 'rustc_private'” #45540

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4e16e30
fix #44953 - The “use of unstable library feature 'rustc_private'” er…
Oct 25, 2017
52d0e51
relax restriction - allow errors to be emmitted within macro spans, a…
Oct 26, 2017
304c8b1
implemented code review
Oct 28, 2017
bb0049b
fixed tidy error
Oct 28, 2017
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29 changes: 26 additions & 3 deletions src/librustc/middle/stability.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ use hir::def_id::{CrateNum, CRATE_DEF_INDEX, DefId, LOCAL_CRATE};
use ty::{self, TyCtxt};
use middle::privacy::AccessLevels;
use syntax::symbol::Symbol;
use syntax_pos::{Span, DUMMY_SP};
use syntax_pos::{Span, MultiSpan, DUMMY_SP};
use syntax::ast;
use syntax::ast::{NodeId, Attribute};
use syntax::feature_gate::{GateIssue, emit_feature_err, find_lang_feature_accepted_version};
Expand Down Expand Up @@ -597,8 +597,31 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
feature.as_str(), &r),
None => format!("use of unstable library feature '{}'", &feature)
};
emit_feature_err(&self.sess.parse_sess, &feature.as_str(), span,
GateIssue::Library(Some(issue)), &msg);


let msp: MultiSpan = span.into();
let cm = &self.sess.parse_sess.codemap();
let span_key =
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You can probably fit the following line on this one.

msp.primary_span().and_then(|sp:Span|
if sp != DUMMY_SP {
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Clean up the formatting for this entire block to avoid as having as much left padding.

let fname = cm.lookup_char_pos(sp.lo()).file.as_ref().name.clone();
if fname.starts_with("<") && fname.ends_with(" macros>") {
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This piece of code could be better as a method of cm.lookup_char_pos(sp.lo()).file.

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Not sure what you meant. Hopefully the way it's written now is better (well, it is better, I don't exactly know why I felt I needed to make it so complicated... )

None
} else {
Some(span)
}
} else {
None
}
);

let tuple = (None, span_key, msg.clone());
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Try to give tuple a more descriptive name. You can also get around that by just inserting the tuple inline ;)

let fresh = self.sess.one_time_diagnostics.borrow_mut().insert(tuple);
if fresh {
emit_feature_err(&self.sess.parse_sess, &feature.as_str(), span,
GateIssue::Library(Some(issue)), &msg);
}

}
Some(_) => {
// Stable APIs are always ok to call and deprecated APIs are
Expand Down
4 changes: 2 additions & 2 deletions src/librustc/session/mod.rs
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Expand Up @@ -78,7 +78,7 @@ pub struct Session {
/// Set of (LintId, Option<Span>, message) tuples tracking lint
/// (sub)diagnostics that have been set once, but should not be set again,
/// in order to avoid redundantly verbose output (Issue #24690).
pub one_time_diagnostics: RefCell<FxHashSet<(lint::LintId, Option<Span>, String)>>,
pub one_time_diagnostics: RefCell<FxHashSet<(Option<lint::LintId>, Option<Span>, String)>>,
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Normally, instead of making the first tuple field an option, I would suggest making the FxHashSet accept a new struct with three fields diagnostic_id, span and message, with diagnostic_id being a new enum that takes either a LintId or a GateIssue. This way we can keep expanding one_time_diagnostics without the risk of having multiple different diagnostics with the same span message and no lint_id, but being different errors, from being incorrectly stopped, but because of the message being there, what you're doing is correct and unlikely to be made incorrect with a subsequent change.

pub plugin_llvm_passes: RefCell<Vec<String>>,
pub plugin_attributes: RefCell<Vec<(String, AttributeType)>>,
pub crate_types: RefCell<Vec<config::CrateType>>,
Expand Down Expand Up @@ -361,7 +361,7 @@ impl Session {
},
_ => {
let lint_id = lint::LintId::of(lint);
let id_span_message = (lint_id, span, message.to_owned());
let id_span_message = (Some(lint_id), span, message.to_owned());
let fresh = self.one_time_diagnostics.borrow_mut().insert(id_span_message);
if fresh {
do_method()
Expand Down