Auto merge of #42690 - frewsxcv:rollup, r=frewsxcv

Rollup of 5 pull requests

- Successful merges: #42616, #42651, #42654, #42656, #42685
- Failed merges:

src/bootstrap/step.rs

@@ -463,7 +463,7 @@ pub fn build_rules<'a>(build: &'a Build) -> Rules {
     rules.test("check-linkchecker", "src/tools/linkchecker")
          .dep(|s| s.name("tool-linkchecker").stage(0))
          .dep(|s| s.name("default:doc"))
-         .default(true)
+         .default(build.config.docs)
          .host(true)
          .run(move |s| check::linkcheck(build, s.target));
     rules.test("check-cargotest", "src/tools/cargotest")
@@ -1407,13 +1407,20 @@ mod tests {
     fn build(args: &[&str],
              extra_host: &[&str],
              extra_target: &[&str]) -> Build {
+        build_(args, extra_host, extra_target, true)
+    }
+
+    fn build_(args: &[&str],
+              extra_host: &[&str],
+              extra_target: &[&str],
+              docs: bool) -> Build {
         let mut args = args.iter().map(|s| s.to_string()).collect::<Vec<_>>();
         args.push("--build".to_string());
         args.push("A".to_string());
         let flags = Flags::parse(&args);
 
         let mut config = Config::default();
-        config.docs = true;
+        config.docs = docs;
         config.build = "A".to_string();
         config.host = vec![config.build.clone()];
         config.host.extend(extra_host.iter().map(|s| s.to_string()));
@@ -1768,4 +1775,22 @@ mod tests {
         assert!(!plan.iter().any(|s| s.name.contains("tidy")));
         assert!(plan.iter().any(|s| s.name.contains("valgrind")));
     }
+
+    #[test]
+    fn test_disable_docs() {
+        let build = build_(&["test"], &[], &[], false);
+        let rules = super::build_rules(&build);
+        let plan = rules.plan();
+        println!("rules: {:#?}", plan);
+        assert!(!plan.iter().any(|s| {
+            s.name.contains("doc-") || s.name.contains("default:doc")
+        }));
+        // none of the dependencies should be a doc rule either
+        assert!(!plan.iter().any(|s| {
+            rules.rules[s.name].deps.iter().any(|dep| {
+                let dep = dep(&rules.sbuild.name(s.name));
+                dep.name.contains("doc-") || dep.name.contains("default:doc")
+            })
+        }));
+    }
 }

src/doc/unstable-book/src/SUMMARY.md

@@ -87,7 +87,6 @@
     - [start](language-features/start.md)
     - [static_nobundle](language-features/static-nobundle.md)
     - [stmt_expr_attributes](language-features/stmt-expr-attributes.md)
-    - [struct_field_attributes](language-features/struct-field-attributes.md)
     - [structural_match](language-features/structural-match.md)
     - [target_feature](language-features/target-feature.md)
     - [thread_local](language-features/thread-local.md)

src/librustc_data_structures/lib.rs

@@ -36,11 +36,11 @@
 #![feature(discriminant_value)]
 #![feature(specialization)]
 #![feature(manually_drop)]
-#![feature(struct_field_attributes)]
 
 #![cfg_attr(stage0, unstable(feature = "rustc_private", issue = "27812"))]
 #![cfg_attr(stage0, feature(rustc_private))]
 #![cfg_attr(stage0, feature(staged_api))]
+#![cfg_attr(stage0, feature(struct_field_attributes))]
 
 #![cfg_attr(unix, feature(libc))]
 #![cfg_attr(test, feature(test))]

src/librustc_errors/emitter.rs

@@ -445,8 +445,11 @@ impl EmitterWriter {
                             && next.has_label())     // multiline start/end, move it to a new line
                         || (annotation.has_label()   // so as not to overlap the orizontal lines.
                             && next.takes_space())
-                        || (annotation.takes_space()
-                            && next.takes_space())
+                        || (annotation.takes_space() && next.takes_space())
+                        || (overlaps(next, annotation, l)
+                            && next.end_col <= annotation.end_col
+                            && next.has_label()
+                            && p == 0)  // Avoid #42595.
                     {
                         // This annotation needs a new line in the output.
                         p += 1;

src/librustc_typeck/check/callee.rs

@@ -15,7 +15,7 @@ use super::method::MethodCallee;
 use hir::def::Def;
 use hir::def_id::{DefId, LOCAL_CRATE};
 use rustc::{infer, traits};
-use rustc::ty::{self, TyCtxt, LvaluePreference, Ty};
+use rustc::ty::{self, TyCtxt, TypeFoldable, LvaluePreference, Ty};
 use rustc::ty::subst::Subst;
 use rustc::ty::adjustment::{Adjustment, Adjust, AutoBorrow};
 use syntax::abi;
@@ -209,17 +209,16 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
                         }
                     }
                 }
-                let mut err = if let Some(path) = unit_variant {
-                    let mut err = self.type_error_struct(call_expr.span, |_| {
-                        format!("`{}` is being called, but it is not a function", path)
-                    }, callee_ty);
+                let mut err = type_error_struct!(self.tcx.sess, call_expr.span, callee_ty, E0618,
+                                                 "expected function, found `{}`",
+                                                 if let Some(ref path) = unit_variant {
+                                                     path.to_string()
+                                                 } else {
+                                                     callee_ty.to_string()
+                                                 });
+                if let Some(path) = unit_variant {
                     err.help(&format!("did you mean to write `{}`?", path));
-                    err
-                } else {
-                    self.type_error_struct(call_expr.span, |actual| {
-                        format!("expected function, found `{}`", actual)
-                    }, callee_ty)
-                };
+                }
 
                 if let hir::ExprCall(ref expr, _) = call_expr.node {
                     let def = if let hir::ExprPath(ref qpath) = expr.node {

src/librustc_typeck/diagnostics.rs

@@ -4195,6 +4195,34 @@ as possible. For better explanations, see The Rust Book:
 https://doc.rust-lang.org/book/
 "##,
 
+E0618: r##"
+Attempted to call something which isn't a function nor a method.
+
+Erroneous code examples:
+
+```compile_fail,E0618
+enum X {
+    Entry,
+}
+
+X::Entry(); // error: expected function, found `X::Entry`
+
+// Or even simpler:
+let x = 0i32;
+x(); // error: expected function, found `i32`
+```
+
+Only functions and methods can be called using `()`. Example:
+
+```
+// We declare a function:
+fn i_am_a_function() {}
+
+// And we call it:
+i_am_a_function();
+```
+"##,
+
 }
 
 register_diagnostics! {

src/libstd/io/mod.rs

@@ -389,7 +389,7 @@ fn read_to_end<R: Read + ?Sized>(r: &mut R, buf: &mut Vec<u8>) -> Result<usize>
 
 /// The `Read` trait allows for reading bytes from a source.
 ///
-/// Implementors of the `Read` trait are sometimes called 'readers'.
+/// Implementors of the `Read` trait are called 'readers'.
 ///
 /// Readers are defined by one required method, `read()`. Each call to `read`
 /// will attempt to pull bytes from this source into a provided buffer. A

src/libsyntax/config.rs

@@ -223,7 +223,6 @@ impl<'a> StripUnconfigured<'a> {
             ast::ExprKind::Struct(path, fields, base) => {
                 let fields = fields.into_iter()
                     .filter_map(|field| {
-                        self.visit_struct_field_attrs(field.attrs());
                         self.configure(field)
                     })
                     .collect();
@@ -256,17 +255,6 @@ impl<'a> StripUnconfigured<'a> {
     }
 
     pub fn configure_struct_expr_field(&mut self, field: ast::Field) -> Option<ast::Field> {
-        if !self.features.map(|features| features.struct_field_attributes).unwrap_or(true) {
-            if !field.attrs.is_empty() {
-                let mut err = feature_err(self.sess,
-                                          "struct_field_attributes",
-                                          field.span,
-                                          GateIssue::Language,
-                                          "attributes on struct literal fields are unstable");
-                err.emit();
-            }
-        }
-
         self.configure(field)
     }
 
@@ -275,7 +263,6 @@ impl<'a> StripUnconfigured<'a> {
             if let ast::PatKind::Struct(path, fields, etc) = pattern.node {
                 let fields = fields.into_iter()
                     .filter_map(|field| {
-                        self.visit_struct_field_attrs(field.attrs());
                         self.configure(field)
                     })
                     .collect();
@@ -284,21 +271,6 @@ impl<'a> StripUnconfigured<'a> {
             pattern
         })
     }
-
-    fn visit_struct_field_attrs(&mut self, attrs: &[ast::Attribute]) {
-        // flag the offending attributes
-        for attr in attrs.iter() {
-            if !self.features.map(|features| features.struct_field_attributes).unwrap_or(true) {
-                let mut err = feature_err(
-                    self.sess,
-                    "struct_field_attributes",
-                    attr.span,
-                    GateIssue::Language,
-                    "attributes on struct pattern or literal fields are unstable");
-                err.emit();
-            }
-        }
-    }
 }
 
 impl<'a> fold::Folder for StripUnconfigured<'a> {

src/libsyntax/feature_gate.rs

@@ -312,9 +312,6 @@ declare_features! (
     // Declarative macros 2.0 (`macro`).
     (active, decl_macro, "1.17.0", Some(39412)),
 
-    // Allows attributes on struct literal fields.
-    (active, struct_field_attributes, "1.16.0", Some(38814)),
-
     // Allows #[link(kind="static-nobundle"...]
     (active, static_nobundle, "1.16.0", Some(37403)),
 
@@ -430,6 +427,8 @@ declare_features! (
     (accepted, relaxed_adts, "1.19.0", Some(35626)),
     // Coerces non capturing closures to function pointers
     (accepted, closure_to_fn_coercion, "1.19.0", Some(39817)),
+    // Allows attributes on struct literal fields.
+    (accepted, struct_field_attributes, "1.20.0", Some(38814)),
 );
 
 // If you change this, please modify src/doc/unstable-book as well. You must

src/libsyntax/test_snippet.rs

@@ -735,6 +735,49 @@ error: foo
 "#);
 }
 
+#[test]
+fn multiple_labels_secondary_without_message_3() {
+    test_harness(r#"
+fn foo() {
+  a  bc  d
+}
+"#,
+    vec![
+        SpanLabel {
+            start: Position {
+                string: "a",
+                count: 1,
+            },
+            end: Position {
+                string: "b",
+                count: 1,
+            },
+            label: "`a` is a good letter",
+        },
+        SpanLabel {
+            start: Position {
+                string: "c",
+                count: 1,
+            },
+            end: Position {
+                string: "d",
+                count: 1,
+            },
+            label: "",
+        },
+    ],
+    r#"
+error: foo
+ --> test.rs:3:3
+  |
+3 |   a  bc  d
+  |   ^^^^----
+  |   |
+  |   `a` is a good letter
+
+"#);
+}
+
 #[test]
 fn multiple_labels_without_message() {
     test_harness(r#"

src/test/compile-fail/struct-field-attr-feature-gate.rs → src/test/compile-fail/E0618.rs

@@ -8,15 +8,13 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// gate-test-struct_field_attributes
-
-struct Foo {
-    present: (),
+enum X {
+    Entry,
 }
 
 fn main() {
-    let foo = Foo { #[cfg(all())] present: () };
-    //~^ ERROR attributes on struct pattern or literal fields are unstable
-    let Foo { #[cfg(all())] present: () } = foo;
-    //~^ ERROR attributes on struct pattern or literal fields are unstable
+    X::Entry(); //~ ERROR expected function, found `X::Entry` [E0618]
+                //~| HELP did you mean to write `X::Entry`?
+    let x = 0i32;
+    x(); //~ ERROR expected function, found `i32` [E0618]
 }

src/test/compile-fail/empty-struct-unit-expr.rs

@@ -24,10 +24,10 @@ enum E {
 fn main() {
     let e2 = Empty2(); //~ ERROR expected function, found `Empty2`
     let e4 = E::Empty4();
-    //~^ ERROR `E::Empty4` is being called, but it is not a function
+    //~^ ERROR expected function, found `E::Empty4` [E0618]
     //~| HELP did you mean to write `E::Empty4`?
     let xe2 = XEmpty2(); //~ ERROR expected function, found `empty_struct::XEmpty2`
     let xe4 = XE::XEmpty4();
-    //~^ ERROR `XE::XEmpty4` is being called, but it is not a function
+    //~^ ERROR expected function, found `XE::XEmpty4` [E0618]
     //~| HELP did you mean to write `XE::XEmpty4`?
 }

src/test/compile-fail/struct-field-cfg.rs

@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(struct_field_attributes)]
-
 struct Foo {
     present: (),
 }