Merge pull request #29112 from brson/beta-next

Beta next

Author: alexcrichton

src/libcore/num/dec2flt/parse.rs

@@ -59,7 +59,12 @@ pub fn parse_decimal(s: &str) -> ParseResult {
     let s = s.as_bytes();
     let (integral, s) = eat_digits(s);
     match s.first() {
-        None => Valid(Decimal::new(integral, b"", 0)),
+        None => {
+            if integral.is_empty() {
+                return Invalid; // No digits at all
+            }
+            Valid(Decimal::new(integral, b"", 0))
+        }
         Some(&b'e') | Some(&b'E') => {
             if integral.is_empty() {
                 return Invalid; // No digits before 'e'

src/libcore/ptr.rs

@@ -385,6 +385,13 @@ fnptr_impls_args! { A, B }
 fnptr_impls_args! { A, B, C }
 fnptr_impls_args! { A, B, C, D }
 fnptr_impls_args! { A, B, C, D, E }
+fnptr_impls_args! { A, B, C, D, E, F }
+fnptr_impls_args! { A, B, C, D, E, F, G }
+fnptr_impls_args! { A, B, C, D, E, F, G, H }
+fnptr_impls_args! { A, B, C, D, E, F, G, H, I }
+fnptr_impls_args! { A, B, C, D, E, F, G, H, I, J }
+fnptr_impls_args! { A, B, C, D, E, F, G, H, I, J, K }
+fnptr_impls_args! { A, B, C, D, E, F, G, H, I, J, K, L }
 
 // Comparison for pointers
 #[stable(feature = "rust1", since = "1.0.0")]

src/libcoretest/num/dec2flt/mod.rs

@@ -101,6 +101,18 @@ fn lonely_dot() {
     assert_eq!(".".parse(), Ok(0.0));
 }
 
+#[test]
+fn lonely_sign() {
+    assert!("+".parse::<f32>().is_err());
+    assert!("-".parse::<f64>().is_err());
+}
+
+#[test]
+fn whitespace() {
+    assert!(" 1.0".parse::<f32>().is_err());
+    assert!("1.0 ".parse::<f64>().is_err());
+}
+
 #[test]
 fn nan() {
     assert!("NaN".parse::<f32>().unwrap().is_nan());

src/librustc/middle/infer/mod.rs

@@ -43,7 +43,7 @@ use std::rc::Rc;
 use syntax::ast;
 use syntax::codemap;
 use syntax::codemap::{Span, DUMMY_SP};
-use util::nodemap::{FnvHashMap, NodeMap};
+use util::nodemap::{FnvHashMap, FnvHashSet, NodeMap};
 
 use self::combine::CombineFields;
 use self::region_inference::{RegionVarBindings, RegionSnapshot};
@@ -92,6 +92,10 @@ pub struct InferCtxt<'a, 'tcx: 'a> {
 
     pub fulfillment_cx: RefCell<traits::FulfillmentContext<'tcx>>,
 
+    // the set of predicates on which errors have been reported, to
+    // avoid reporting the same error twice.
+    pub reported_trait_errors: RefCell<FnvHashSet<traits::TraitErrorKey<'tcx>>>,
+
     // This is a temporary field used for toggling on normalization in the inference context,
     // as we move towards the approach described here:
     // https://internals.rust-lang.org/t/flattening-the-contexts-for-fun-and-profit/2293
@@ -374,6 +378,7 @@ pub fn new_infer_ctxt<'a, 'tcx>(tcx: &'a ty::ctxt<'tcx>,
         region_vars: RegionVarBindings::new(tcx),
         parameter_environment: param_env.unwrap_or(tcx.empty_parameter_environment()),
         fulfillment_cx: RefCell::new(traits::FulfillmentContext::new(errors_will_be_reported)),
+        reported_trait_errors: RefCell::new(FnvHashSet()),
         normalize: false,
         err_count_on_creation: tcx.sess.err_count()
     }
@@ -1389,9 +1394,16 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         self.resolve_type_vars_or_error(&ty)
     }
 
+    pub fn tables_are_tcx_tables(&self) -> bool {
+        let tables: &RefCell<ty::Tables> = &self.tables;
+        let tcx_tables: &RefCell<ty::Tables> = &self.tcx.tables;
+        tables as *const _ == tcx_tables as *const _
+    }
+
     pub fn type_moves_by_default(&self, ty: Ty<'tcx>, span: Span) -> bool {
         let ty = self.resolve_type_vars_if_possible(&ty);
-        if ty.needs_infer() {
+        if ty.needs_infer() ||
+            (ty.has_closure_types() && !self.tables_are_tcx_tables()) {
             // this can get called from typeck (by euv), and moves_by_default
             // rightly refuses to work with inference variables, but
             // moves_by_default has a cache, which we want to use in other

src/librustc/middle/reachable.rs

@@ -348,13 +348,17 @@ impl<'a, 'tcx> ReachableContext<'a, 'tcx> {
     // this properly would result in the necessity of computing *type*
     // reachability, which might result in a compile time loss.
     fn mark_destructors_reachable(&mut self) {
-        for adt in self.tcx.adt_defs() {
-            if let Some(destructor_def_id) = adt.destructor() {
-                if destructor_def_id.is_local() {
-                    self.reachable_symbols.insert(destructor_def_id.node);
+        let drop_trait = match self.tcx.lang_items.drop_trait() {
+            Some(id) => self.tcx.lookup_trait_def(id), None => { return }
+        };
+        drop_trait.for_each_impl(self.tcx, |drop_impl| {
+            for destructor in &self.tcx.impl_items.borrow()[&drop_impl] {
+                let destructor_did = destructor.def_id();
+                if destructor_did.is_local() {
+                    self.reachable_symbols.insert(destructor_did.node);
                 }
             }
-        }
+        })
     }
 }
 

src/librustc/middle/traits/error_reporting.rs

@@ -28,11 +28,32 @@ use middle::def_id::DefId;
 use middle::infer::InferCtxt;
 use middle::ty::{self, ToPredicate, HasTypeFlags, ToPolyTraitRef, TraitRef, Ty};
 use middle::ty::fold::TypeFoldable;
-use std::collections::HashMap;
+use util::nodemap::{FnvHashMap, FnvHashSet};
+
 use std::fmt;
 use syntax::codemap::Span;
 use rustc_front::attr::{AttributeMethods, AttrMetaMethods};
 
+#[derive(Debug, PartialEq, Eq, Hash)]
+pub struct TraitErrorKey<'tcx> {
+    is_warning: bool,
+    span: Span,
+    predicate: ty::Predicate<'tcx>
+}
+
+impl<'tcx> TraitErrorKey<'tcx> {
+    fn from_error<'a>(infcx: &InferCtxt<'a, 'tcx>,
+                      e: &FulfillmentError<'tcx>) -> Self {
+        let predicate =
+            infcx.resolve_type_vars_if_possible(&e.obligation.predicate);
+        TraitErrorKey {
+            is_warning: is_warning(&e.obligation),
+            span: e.obligation.cause.span,
+            predicate: infcx.tcx.erase_regions(&predicate)
+        }
+    }
+}
+
 pub fn report_fulfillment_errors<'a, 'tcx>(infcx: &InferCtxt<'a, 'tcx>,
                                            errors: &Vec<FulfillmentError<'tcx>>) {
     for error in errors {
@@ -42,6 +63,13 @@ pub fn report_fulfillment_errors<'a, 'tcx>(infcx: &InferCtxt<'a, 'tcx>,
 
 fn report_fulfillment_error<'a, 'tcx>(infcx: &InferCtxt<'a, 'tcx>,
                                       error: &FulfillmentError<'tcx>) {
+    let error_key = TraitErrorKey::from_error(infcx, error);
+    debug!("report_fulfillment_errors({:?}) - key={:?}",
+           error, error_key);
+    if !infcx.reported_trait_errors.borrow_mut().insert(error_key) {
+        debug!("report_fulfillment_errors: skipping duplicate");
+        return;
+    }
     match error.code {
         FulfillmentErrorCode::CodeSelectionError(ref e) => {
             report_selection_error(infcx, &error.obligation, e);
@@ -97,7 +125,7 @@ fn report_on_unimplemented<'a, 'tcx>(infcx: &InferCtxt<'a, 'tcx>,
                                                (gen.name.as_str().to_string(),
                                                 trait_ref.substs.types.get(param, i)
                                                          .to_string())
-                                              }).collect::<HashMap<String, String>>();
+                                              }).collect::<FnvHashMap<String, String>>();
                 generic_map.insert("Self".to_string(),
                                    trait_ref.self_ty().to_string());
                 let parser = Parser::new(&istring);
@@ -302,7 +330,11 @@ pub fn report_object_safety_error<'tcx>(tcx: &ty::ctxt<'tcx>,
         "the trait `{}` cannot be made into an object",
         tcx.item_path_str(trait_def_id));
 
+    let mut reported_violations = FnvHashSet();
     for violation in object_safety_violations(tcx, trait_def_id) {
+        if !reported_violations.insert(violation.clone()) {
+            continue;
+        }
         match violation {
             ObjectSafetyViolation::SizedSelf => {
                 tcx.sess.fileline_note(

src/librustc/middle/traits/fulfill.rs

@@ -49,6 +49,12 @@ pub struct FulfillmentContext<'tcx> {
     // than the `SelectionCache`: it avoids duplicate errors and
     // permits recursive obligations, which are often generated from
     // traits like `Send` et al.
+    //
+    // Note that because of type inference, a predicate can still
+    // occur twice in the predicates list, for example when 2
+    // initially-distinct type variables are unified after being
+    // inserted. Deduplicating the predicate set on selection had a
+    // significant performance cost the last time I checked.
     duplicate_set: FulfilledPredicates<'tcx>,
 
     // A list of all obligations that have been registered with this

src/librustc/middle/traits/mod.rs

@@ -21,10 +21,12 @@ use middle::subst;
 use middle::ty::{self, HasTypeFlags, Ty};
 use middle::ty::fold::TypeFoldable;
 use middle::infer::{self, fixup_err_to_string, InferCtxt};
+
 use std::rc::Rc;
 use syntax::ast;
 use syntax::codemap::{Span, DUMMY_SP};
 
+pub use self::error_reporting::TraitErrorKey;
 pub use self::error_reporting::report_fulfillment_errors;
 pub use self::error_reporting::report_overflow_error;
 pub use self::error_reporting::report_selection_error;

src/librustc/middle/traits/object_safety.rs

@@ -27,7 +27,7 @@ use middle::ty::{self, ToPolyTraitRef, Ty};
 use std::rc::Rc;
 use syntax::ast;
 
-#[derive(Debug)]
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub enum ObjectSafetyViolation<'tcx> {
     /// Self : Sized declared on the trait
     SizedSelf,

src/librustc/middle/ty/context.rs

@@ -245,9 +245,6 @@ pub struct ctxt<'tcx> {
     /// True if the variance has been computed yet; false otherwise.
     pub variance_computed: Cell<bool>,
 
-    /// A method will be in this list if and only if it is a destructor.
-    pub destructors: RefCell<DefIdSet>,
-
     /// Maps a DefId of a type to a list of its inherent impls.
     /// Contains implementations of methods that are inherent to a type.
     /// Methods in these implementations don't need to be exported.
@@ -475,7 +472,6 @@ impl<'tcx> ctxt<'tcx> {
             normalized_cache: RefCell::new(FnvHashMap()),
             lang_items: lang_items,
             provided_method_sources: RefCell::new(DefIdMap()),
-            destructors: RefCell::new(DefIdSet()),
             inherent_impls: RefCell::new(DefIdMap()),
             impl_items: RefCell::new(DefIdMap()),
             used_unsafe: RefCell::new(NodeSet()),