Consistently call editions "Rust 20xx" in messages.

compiler/rustc_parse/src/parser/expr.rs

@@ -2109,7 +2109,7 @@ impl<'a> Parser<'a> {
 
         let mut async_block_err = |e: &mut DiagnosticBuilder<'_>, span: Span| {
             recover_async = true;
-            e.span_label(span, "`async` blocks are only allowed in edition 2018 or later");
+            e.span_label(span, "`async` blocks are only allowed in Rust 2018 or later");
             e.help(&format!("set `edition = \"{}\"` in `Cargo.toml`", LATEST_STABLE_EDITION));
             e.note("for more on editions, read https://doc.rust-lang.org/edition-guide");
         };

compiler/rustc_parse/src/parser/item.rs

@@ -1667,7 +1667,7 @@ impl<'a> Parser<'a> {
     fn ban_async_in_2015(&self, span: Span) {
         if span.rust_2015() {
             let diag = self.diagnostic();
-            struct_span_err!(diag, span, E0670, "`async fn` is not permitted in the 2015 edition")
+            struct_span_err!(diag, span, E0670, "`async fn` is not permitted in Rust 2015")
                 .span_label(span, "to use `async fn`, switch to Rust 2018 or later")
                 .help(&format!("set `edition = \"{}\"` in `Cargo.toml`", LATEST_STABLE_EDITION))
                 .note("for more on editions, read https://doc.rust-lang.org/edition-guide")

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -180,7 +180,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
             (
                 format!("cannot find {} `{}` in {}{}", expected, item_str, mod_prefix, mod_str),
                 if path_str == "async" && expected.starts_with("struct") {
-                    "`async` blocks are only allowed in the 2018 edition".to_string()
+                    "`async` blocks are only allowed in Rust 2018 or later".to_string()
                 } else {
                     format!("not found in {}", mod_str)
                 },
@@ -904,7 +904,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
                     Applicability::MaybeIncorrect,
                 );
                 if path_str == "try" && span.rust_2015() {
-                    err.note("if you want the `try` keyword, you need to be in the 2018 edition");
+                    err.note("if you want the `try` keyword, you need Rust 2018 or later");
                 }
             }
             (Res::Def(DefKind::TyAlias, def_id), PathSource::Trait(_)) => {

src/test/ui/async-await/edition-deny-async-fns-2015.rs

@@ -1,21 +1,21 @@
 // edition:2015
 
-async fn foo() {} //~ ERROR `async fn` is not permitted in the 2015 edition
+async fn foo() {} //~ ERROR `async fn` is not permitted in Rust 2015
 
-fn baz() { async fn foo() {} } //~ ERROR `async fn` is not permitted in the 2015 edition
+fn baz() { async fn foo() {} } //~ ERROR `async fn` is not permitted in Rust 2015
 
-async fn async_baz() { //~ ERROR `async fn` is not permitted in the 2015 edition
+async fn async_baz() { //~ ERROR `async fn` is not permitted in Rust 2015
-    async fn bar() {} //~ ERROR `async fn` is not permitted in the 2015 edition
+    async fn bar() {} //~ ERROR `async fn` is not permitted in Rust 2015
 }
 
 struct Foo {}
 
 impl Foo {
-    async fn foo() {} //~ ERROR `async fn` is not permitted in the 2015 edition
+    async fn foo() {} //~ ERROR `async fn` is not permitted in Rust 2015
 }
 
 trait Bar {
-    async fn foo() {} //~ ERROR `async fn` is not permitted in the 2015 edition
+    async fn foo() {} //~ ERROR `async fn` is not permitted in Rust 2015
                       //~^ ERROR functions in traits cannot be declared `async`
 }
 
@@ -23,16 +23,16 @@ fn main() {
     macro_rules! accept_item { ($x:item) => {} }
 
     accept_item! {
-        async fn foo() {} //~ ERROR `async fn` is not permitted in the 2015 edition
+        async fn foo() {} //~ ERROR `async fn` is not permitted in Rust 2015
     }
 
     accept_item! {
         impl Foo {
-            async fn bar() {} //~ ERROR `async fn` is not permitted in the 2015 edition
+            async fn bar() {} //~ ERROR `async fn` is not permitted in Rust 2015
         }
     }
 
     let inside_closure = || {
-        async fn bar() {} //~ ERROR `async fn` is not permitted in the 2015 edition
+        async fn bar() {} //~ ERROR `async fn` is not permitted in Rust 2015
     };
 }

src/test/ui/async-await/edition-deny-async-fns-2015.stderr

@@ -1,4 +1,4 @@
-error[E0670]: `async fn` is not permitted in the 2015 edition
+error[E0670]: `async fn` is not permitted in Rust 2015
   --> $DIR/edition-deny-async-fns-2015.rs:3:1
    |
 LL | async fn foo() {}
@@ -7,7 +7,7 @@ LL | async fn foo() {}
    = help: set `edition = "2018"` in `Cargo.toml`
    = note: for more on editions, read https://doc.rust-lang.org/edition-guide
 
-error[E0670]: `async fn` is not permitted in the 2015 edition
+error[E0670]: `async fn` is not permitted in Rust 2015
   --> $DIR/edition-deny-async-fns-2015.rs:5:12
    |
 LL | fn baz() { async fn foo() {} }
@@ -16,7 +16,7 @@ LL | fn baz() { async fn foo() {} }
    = help: set `edition = "2018"` in `Cargo.toml`
    = note: for more on editions, read https://doc.rust-lang.org/edition-guide
 
-error[E0670]: `async fn` is not permitted in the 2015 edition
+error[E0670]: `async fn` is not permitted in Rust 2015
   --> $DIR/edition-deny-async-fns-2015.rs:7:1
    |
 LL | async fn async_baz() {
@@ -25,7 +25,7 @@ LL | async fn async_baz() {
    = help: set `edition = "2018"` in `Cargo.toml`
    = note: for more on editions, read https://doc.rust-lang.org/edition-guide
 
-error[E0670]: `async fn` is not permitted in the 2015 edition
+error[E0670]: `async fn` is not permitted in Rust 2015
   --> $DIR/edition-deny-async-fns-2015.rs:8:5
    |
 LL |     async fn bar() {}
@@ -34,7 +34,7 @@ LL |     async fn bar() {}
    = help: set `edition = "2018"` in `Cargo.toml`
    = note: for more on editions, read https://doc.rust-lang.org/edition-guide
 
-error[E0670]: `async fn` is not permitted in the 2015 edition
+error[E0670]: `async fn` is not permitted in Rust 2015
   --> $DIR/edition-deny-async-fns-2015.rs:14:5
    |
 LL |     async fn foo() {}
@@ -43,7 +43,7 @@ LL |     async fn foo() {}
    = help: set `edition = "2018"` in `Cargo.toml`
    = note: for more on editions, read https://doc.rust-lang.org/edition-guide
 
-error[E0670]: `async fn` is not permitted in the 2015 edition
+error[E0670]: `async fn` is not permitted in Rust 2015
   --> $DIR/edition-deny-async-fns-2015.rs:18:5
    |
 LL |     async fn foo() {}
@@ -52,7 +52,7 @@ LL |     async fn foo() {}
    = help: set `edition = "2018"` in `Cargo.toml`
    = note: for more on editions, read https://doc.rust-lang.org/edition-guide
 
-error[E0670]: `async fn` is not permitted in the 2015 edition
+error[E0670]: `async fn` is not permitted in Rust 2015
   --> $DIR/edition-deny-async-fns-2015.rs:36:9
    |
 LL |         async fn bar() {}
@@ -61,7 +61,7 @@ LL |         async fn bar() {}
    = help: set `edition = "2018"` in `Cargo.toml`
    = note: for more on editions, read https://doc.rust-lang.org/edition-guide
 
-error[E0670]: `async fn` is not permitted in the 2015 edition
+error[E0670]: `async fn` is not permitted in Rust 2015
   --> $DIR/edition-deny-async-fns-2015.rs:26:9
    |
 LL |         async fn foo() {}
@@ -70,7 +70,7 @@ LL |         async fn foo() {}
    = help: set `edition = "2018"` in `Cargo.toml`
    = note: for more on editions, read https://doc.rust-lang.org/edition-guide
 
-error[E0670]: `async fn` is not permitted in the 2015 edition
+error[E0670]: `async fn` is not permitted in Rust 2015
   --> $DIR/edition-deny-async-fns-2015.rs:31:13
    |
 LL |             async fn bar() {}

src/test/ui/editions/async-block-2015.rs

@@ -1,13 +1,13 @@
 async fn foo() {
-//~^ ERROR `async fn` is not permitted in the 2015 edition
+//~^ ERROR `async fn` is not permitted in Rust 2015
 //~| NOTE to use `async fn`, switch to Rust 2018 or later
 //~| HELP set `edition = "2018"` in `Cargo.toml`
 //~| NOTE for more on editions, read https://doc.rust-lang.org/edition-guide
 
     let x = async {};
     //~^ ERROR cannot find struct, variant or union type `async` in this scope
-    //~| NOTE `async` blocks are only allowed in the 2018 edition
+    //~| NOTE `async` blocks are only allowed in Rust 2018 or later
-    let y = async { //~ NOTE `async` blocks are only allowed in edition 2018 or later
+    let y = async { //~ NOTE `async` blocks are only allowed in Rust 2018 or later
         let x = 42;
         //~^ ERROR expected identifier, found keyword `let`
         //~| NOTE expected identifier, found keyword
@@ -15,7 +15,7 @@ async fn foo() {
         //~| NOTE for more on editions, read https://doc.rust-lang.org/edition-guide
         42
     };
-    let z = async { //~ NOTE `async` blocks are only allowed in edition 2018 or later
+    let z = async { //~ NOTE `async` blocks are only allowed in Rust 2018 or later
         42
         //~^ ERROR expected identifier, found `42`
         //~| NOTE expected identifier

src/test/ui/editions/async-block-2015.stderr

@@ -1,4 +1,4 @@
-error[E0670]: `async fn` is not permitted in the 2015 edition
+error[E0670]: `async fn` is not permitted in Rust 2015
   --> $DIR/async-block-2015.rs:1:1
    |
 LL | async fn foo() {
@@ -11,7 +11,7 @@ error: expected identifier, found keyword `let`
   --> $DIR/async-block-2015.rs:11:9
    |
 LL |     let y = async {
-   |             ----- `async` blocks are only allowed in edition 2018 or later
+   |             ----- `async` blocks are only allowed in Rust 2018 or later
 LL |         let x = 42;
    |         ^^^ expected identifier, found keyword
    |
@@ -22,7 +22,7 @@ error: expected identifier, found `42`
   --> $DIR/async-block-2015.rs:19:9
    |
 LL |     let z = async {
-   |             ----- `async` blocks are only allowed in edition 2018 or later
+   |             ----- `async` blocks are only allowed in Rust 2018 or later
 LL |         42
    |         ^^ expected identifier
    |
@@ -33,7 +33,7 @@ error[E0422]: cannot find struct, variant or union type `async` in this scope
   --> $DIR/async-block-2015.rs:7:13
    |
 LL |     let x = async {};
-   |             ^^^^^ `async` blocks are only allowed in the 2018 edition
+   |             ^^^^^ `async` blocks are only allowed in Rust 2018 or later
 
 error: aborting due to 4 previous errors
 

src/test/ui/try-block/try-block-in-edition2015.stderr

@@ -13,7 +13,7 @@ error[E0574]: expected struct, variant or union type, found macro `try`
 LL |     let try_result: Option<_> = try {
    |                                 ^^^ not a struct, variant or union type
    |
-   = note: if you want the `try` keyword, you need to be in the 2018 edition
+   = note: if you want the `try` keyword, you need Rust 2018 or later
 help: use `!` to invoke the macro
    |
 LL |     let try_result: Option<_> = try! {