Auto merge of #23512 - oli-obk:result_ok_unwrap, r=alexcrichton

because then the call to `unwrap()` will not print the error object.

Author: bors

src/libcore/result.rs

@@ -78,7 +78,7 @@
 //! let bad_result: Result<int, int> = bad_result.or_else(|i| Ok(11));
 //!
 //! // Consume the result and return the contents with `unwrap`.
-//! let final_awesome_result = good_result.ok().unwrap();
+//! let final_awesome_result = good_result.unwrap();
 //! ```
 //!
 //! # Results must be used
@@ -460,7 +460,7 @@ impl<T, E> Result<T, E> {
     ///         line.trim_right().parse::<int>().unwrap_or(0)
     ///     });
     ///     // Add the value if there were no errors, otherwise add 0
-    ///     sum += val.ok().unwrap_or(0);
+    ///     sum += val.unwrap_or(0);
     /// }
     ///
     /// assert!(sum == 10);

src/librustc/middle/astencode.rs

@@ -43,6 +43,7 @@ use std::io::SeekFrom;
 use std::io::prelude::*;
 use std::num::FromPrimitive;
 use std::rc::Rc;
+use std::fmt::Debug;
 
 use rbml::reader;
 use rbml::writer::Encoder;
@@ -313,9 +314,11 @@ trait def_id_encoder_helpers {
     fn emit_def_id(&mut self, did: ast::DefId);
 }
 
-impl<S:serialize::Encoder> def_id_encoder_helpers for S {
+impl<S:serialize::Encoder> def_id_encoder_helpers for S
+    where <S as serialize::serialize::Encoder>::Error: Debug
+{
     fn emit_def_id(&mut self, did: ast::DefId) {
-        did.encode(self).ok().unwrap()
+        did.encode(self).unwrap()
     }
 }
 
@@ -325,15 +328,18 @@ trait def_id_decoder_helpers {
                          cdata: &cstore::crate_metadata) -> ast::DefId;
 }
 
-impl<D:serialize::Decoder> def_id_decoder_helpers for D {
+impl<D:serialize::Decoder> def_id_decoder_helpers for D
+    where <D as serialize::serialize::Decoder>::Error: Debug
+{
     fn read_def_id(&mut self, dcx: &DecodeContext) -> ast::DefId {
-        let did: ast::DefId = Decodable::decode(self).ok().unwrap();
+        let did: ast::DefId = Decodable::decode(self).unwrap();
         did.tr(dcx)
     }
 
     fn read_def_id_nodcx(&mut self,
-                         cdata: &cstore::crate_metadata) -> ast::DefId {
-        let did: ast::DefId = Decodable::decode(self).ok().unwrap();
+                         cdata: &cstore::crate_metadata)
+                         -> ast::DefId {
+        let did: ast::DefId = Decodable::decode(self).unwrap();
         decoder::translate_def_id(cdata, did)
     }
 }
@@ -1784,7 +1790,7 @@ impl<'a, 'tcx> rbml_decoder_decoder_helpers<'tcx> for reader::Decoder<'a> {
     fn read_closure_kind<'b, 'c>(&mut self, _dcx: &DecodeContext<'b, 'c, 'tcx>)
                                  -> ty::ClosureKind
     {
-        Decodable::decode(self).ok().unwrap()
+        Decodable::decode(self).unwrap()
     }
 
     fn read_closure_ty<'b, 'c>(&mut self, dcx: &DecodeContext<'b, 'c, 'tcx>)

src/librustc/middle/cfg/graphviz.rs

@@ -54,10 +54,10 @@ fn replace_newline_with_backslash_l(s: String) -> String {
 }
 
 impl<'a, 'ast> dot::Labeller<'a, Node<'a>, Edge<'a>> for LabelledCFG<'a, 'ast> {
-    fn graph_id(&'a self) -> dot::Id<'a> { dot::Id::new(&self.name[..]).ok().unwrap() }
+    fn graph_id(&'a self) -> dot::Id<'a> { dot::Id::new(&self.name[..]).unwrap() }
 
     fn node_id(&'a self, &(i,_): &Node<'a>) -> dot::Id<'a> {
-        dot::Id::new(format!("N{}", i.node_id())).ok().unwrap()
+        dot::Id::new(format!("N{}", i.node_id())).unwrap()
     }
 
     fn node_label(&'a self, &(i, n): &Node<'a>) -> dot::LabelText<'a> {

src/librustc/middle/infer/region_inference/graphviz.rs

@@ -69,13 +69,13 @@ pub fn maybe_print_constraints_for<'a, 'tcx>(region_vars: &RegionVarBindings<'a,
         return;
     }
 
-    let requested_output = env::var("RUST_REGION_GRAPH").ok();
+    let requested_output = env::var("RUST_REGION_GRAPH");
     debug!("requested_output: {:?} requested_node: {:?}",
            requested_output, requested_node);
 
     let output_path = {
         let output_template = match requested_output {
-            Some(ref s) if &**s == "help" => {
+            Ok(ref s) if &**s == "help" => {
                 static PRINTED_YET: AtomicBool = ATOMIC_BOOL_INIT;
                 if !PRINTED_YET.load(Ordering::SeqCst) {
                     print_help_message();
@@ -84,8 +84,8 @@ pub fn maybe_print_constraints_for<'a, 'tcx>(region_vars: &RegionVarBindings<'a,
                 return;
             }
 
-            Some(other_path) => other_path,
-            None => "/tmp/constraints.node%.dot".to_string(),
+            Ok(other_path) => other_path,
+            Err(_) => "/tmp/constraints.node%.dot".to_string(),
         };
 
         if output_template.len() == 0 {
@@ -171,7 +171,7 @@ impl<'a, 'tcx> ConstraintGraph<'a, 'tcx> {
 
 impl<'a, 'tcx> dot::Labeller<'a, Node, Edge> for ConstraintGraph<'a, 'tcx> {
     fn graph_id(&self) -> dot::Id {
-        dot::Id::new(&*self.graph_name).ok().unwrap()
+        dot::Id::new(&*self.graph_name).unwrap()
     }
     fn node_id(&self, n: &Node) -> dot::Id {
         let node_id = match self.node_ids.get(n) {

src/librustc_borrowck/borrowck/gather_loans/mod.rs

@@ -491,7 +491,7 @@ impl<'a, 'tcx, 'v> Visitor<'v> for StaticInitializerCtxt<'a, 'tcx> {
         if let ast::ExprAddrOf(mutbl, ref base) = ex.node {
             let param_env = ty::empty_parameter_environment(self.bccx.tcx);
             let mc = mc::MemCategorizationContext::new(&param_env);
-            let base_cmt = mc.cat_expr(&**base).ok().unwrap();
+            let base_cmt = mc.cat_expr(&**base).unwrap();
             let borrow_kind = ty::BorrowKind::from_mutbl(mutbl);
             // Check that we don't allow borrows of unsafe static items.
             if check_aliasability(self.bccx, ex.span, euv::AddrOf,

src/libstd/fs/mod.rs

@@ -1537,7 +1537,7 @@ mod tests {
     #[test]
     fn binary_file() {
         let mut bytes = [0; 1024];
-        StdRng::new().ok().unwrap().fill_bytes(&mut bytes);
+        StdRng::new().unwrap().fill_bytes(&mut bytes);
 
         let tmpdir = tmpdir();
 

src/libstd/io/cursor.rs

@@ -277,7 +277,7 @@ mod tests {
     fn read_to_end() {
         let mut reader = Cursor::new(vec!(0, 1, 2, 3, 4, 5, 6, 7));
         let mut v = Vec::new();
-        reader.read_to_end(&mut v).ok().unwrap();
+        reader.read_to_end(&mut v).unwrap();
         assert_eq!(v, [0, 1, 2, 3, 4, 5, 6, 7]);
     }
 

src/libstd/net/addr.rs

@@ -617,7 +617,7 @@ mod tests {
                  unique_local: bool, global: bool,
                  u_link_local: bool, u_site_local: bool, u_global: bool,
                  m_scope: Option<Ipv6MulticastScope>) {
-            let ip: Ipv6Addr = str_addr.parse().ok().unwrap();
+            let ip: Ipv6Addr = str_addr.parse().unwrap();
             assert_eq!(str_addr, ip.to_string());
 
             assert_eq!(ip.is_unspecified(), unspec);

src/libstd/old_io/fs.rs

@@ -1608,7 +1608,7 @@ mod test {
         use rand::{StdRng, Rng};
 
         let mut bytes = [0; 1024];
-        StdRng::new().ok().unwrap().fill_bytes(&mut bytes);
+        StdRng::new().unwrap().fill_bytes(&mut bytes);
 
         let tmpdir = tmpdir();
 

src/libstd/sync/mpsc/mod.rs

@@ -592,7 +592,7 @@ impl<T: Send> Sender<T> {
                                 // asleep (we're looking at it), so the receiver
                                 // can't go away.
                                 (*a.get()).send(t).ok().unwrap();
-                        token.signal();
+                                token.signal();
                                 (a, Ok(()))
                             }
                         }