feat: change default edition to 2018 (#3942)

Author: calebcartwright

Configurations.md

@@ -2352,7 +2352,7 @@ Replace uses of the try! macro by the ? shorthand
 
 ```rust
 fn main() {
-    let lorem = try!(ipsum.map(|dolor| dolor.sit()));
+    let lorem = r#try!(ipsum.map(|dolor| dolor.sit()));
 }
 ```
 

src/config/mod.rs

@@ -107,7 +107,7 @@ create_config! {
         "Maximum number of blank lines which can be put between items";
     blank_lines_lower_bound: usize, 0, false,
         "Minimum number of blank lines which must be put between items";
-    edition: Edition, Edition::Edition2015, true, "The edition of the parser (RFC 2052)";
+    edition: Edition, Edition::Edition2018, true, "The edition of the parser (RFC 2052)";
     version: Version, Version::One, false, "Version of formatting rules";
     inline_attribute_width: usize, 0, false,
         "Write an item and its attribute on the same line \
@@ -531,7 +531,7 @@ trailing_comma = "Vertical"
 match_block_trailing_comma = false
 blank_lines_upper_bound = 1
 blank_lines_lower_bound = 0
-edition = "2015"
+edition = "2018"
 version = "One"
 inline_attribute_width = 0
 merge_derives = true

src/config/options.rs

@@ -380,7 +380,7 @@ pub enum Edition {
 
 impl Default for Edition {
     fn default() -> Edition {
-        Edition::Edition2015
+        Edition::Edition2018
     }
 }
 

src/macros.rs

@@ -1190,7 +1190,12 @@ fn next_space(tok: &TokenKind) -> SpaceState {
 /// when the macro is not an instance of `try!` (or parsing the inner expression
 /// failed).
 pub(crate) fn convert_try_mac(mac: &ast::Mac, context: &RewriteContext<'_>) -> Option<ast::Expr> {
-    if &mac.path.to_string() == "try" {
+    // The `try!` macro was deprecated in Rust 1.39.0 and `try` is a
+    // reserved keyword in the 2018 Edition so the raw identifier
+    // `r#try!` must be used in the 2018 Edition.
+    // https://doc.rust-lang.org/std/macro.try.html
+    // https://github.com/rust-lang/rust/pull/62672
+    if &mac.path.to_string() == "try" || &mac.path.to_string() == "r#try" {
         let ts: TokenStream = mac.tts.clone();
         let mut parser = new_parser_from_tts(context.parse_sess.inner(), ts.trees().collect());
 

tests/source/configs/indent_style/block_call.rs

@@ -18,8 +18,8 @@ fn main() {
     }
 
     // nesting macro and function call
-    try!(foo(xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx));
-    try!(foo(try!(xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx)));
+    r#try!(foo(xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx));
+    r#try!(foo(r#try!(xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx)));
 }
 
 // #1521

tests/source/configs/use_try_shorthand/false.rs

@@ -2,5 +2,5 @@
 // Use try! shorthand
 
 fn main() {
-    let lorem = try!(ipsum.map(|dolor| dolor.sit()));
+    let lorem = r#try!(ipsum.map(|dolor| dolor.sit()));
 }

tests/source/configs/use_try_shorthand/true.rs

@@ -2,5 +2,5 @@
 // Use try! shorthand
 
 fn main() {
-    let lorem = try!(ipsum.map(|dolor| dolor.sit()));
+    let lorem = r#try!(ipsum.map(|dolor| dolor.sit()));
 }

tests/source/configs/use_try_shorthand/true_2015_edition.rs

@@ -0,0 +1,7 @@
+// rustfmt-use_try_shorthand: true
+// rustfmt-edition: 2015
+// Use try! shorthand
+
+fn main() {
+    let lorem = try!(ipsum.map(|dolor| dolor.sit()));
+}

tests/source/imports.rs

@@ -62,7 +62,7 @@ use foo::{baz, qux as bar};
 use ::foo;
 use ::foo::{Bar};
 use ::foo::{Bar, Baz};
-use ::{Foo};
+use ::{qux};
 use ::{Bar, Baz};
 
 // Root globs
@@ -104,4 +104,4 @@ use std::f64::consts::{SQRT_2, E, PI};
 
 // #3273
 #[rustfmt::skip]
-use std::fmt::{self, {Display, Formatter}};
+use std::fmt::{self, {Display, Formatter}};

tests/source/imports_2015_edition.rs

@@ -0,0 +1,108 @@
+// rustfmt-normalize_comments: true
+// rustfmt-edition: 2015
+
+// Imports.
+
+// Long import.
+use syntax::ast::{ItemForeignMod, ItemImpl, ItemMac, ItemMod, ItemStatic, ItemDefaultImpl};
+use exceedingly::looooooooooooooooooooooooooooooooooooooooooooooooooooooooooong::import::path::{ItemA, ItemB};
+use exceedingly::loooooooooooooooooooooooooooooooooooooooooooooooooooooooong::import::path::{ItemA, ItemB};
+
+use list::{
+    // Some item
+    SomeItem /* Comment */, /* Another item */ AnotherItem /* Another Comment */, // Last Item
+    LastItem
+};
+
+use test::{  Other          /* C   */  , /*   A   */ self  /*    B     */    };
+
+use syntax::{self};
+use {/* Pre-comment! */
+     Foo, Bar /* comment */};
+use Foo::{Bar, Baz};
+pub use syntax::ast::{Expr_, Expr, ExprAssign, ExprCall, ExprMethodCall, ExprPath};
+
+use syntax::some::{};
+
+use self;
+use std::io::{self};
+use std::io::self;
+
+mod Foo {
+    pub use syntax::ast::{
+        ItemForeignMod,
+        ItemImpl, 
+        ItemMac,
+        ItemMod,
+        ItemStatic, 
+        ItemDefaultImpl
+    };
+
+    mod Foo2 {
+        pub use syntax::ast::{ItemForeignMod, ItemImpl, ItemMac, ItemMod, ItemStatic, self, ItemDefaultImpl};
+    }
+}
+
+fn test() {
+use Baz::*;
+        use Qux;
+}
+
+// Simple imports
+use  foo::bar::baz as baz ;
+use bar::quux  as    kaas;
+use  foo;
+
+// With aliases.
+use foo::{self as bar, baz};
+use foo::{self as bar};
+use foo::{qux as bar};
+use foo::{baz, qux as bar};
+
+// With absolute paths
+use ::foo;
+use ::foo::{Bar};
+use ::foo::{Bar, Baz};
+use ::{Foo};
+use ::{Bar, Baz};
+
+// Root globs
+use *;
+use ::*;
+
+// spaces used to cause glob imports to disappear (#1356)
+use super:: * ;
+use foo::issue_1356:: * ;
+
+// We shouldn't remove imports which have attributes attached (#1858)
+#[cfg(unix)]
+use self::unix::{};
+
+// nested imports
+use foo::{a, bar::{baz, qux, xxxxxxxxxxx, yyyyyyyyyyyyy, zzzzzzzzzzzzzzzz, foo::{a, b, cxxxxxxxxxxxxx, yyyyyyyyyyyyyy, zzzzzzzzzzzzzzzz}}, b, boo, c,};
+
+use fooo::{baar::{foobar::{xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy, zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz}}, z, bar, bar::*, x, y};
+
+use exonum::{api::{Api, ApiError}, blockchain::{self, BlockProof, Blockchain, Transaction, TransactionSet}, crypto::{Hash, PublicKey}, helpers::Height, node::TransactionSend, storage::{ListProof, MapProof}};
+
+// nested imports with a single sub-tree.
+use a::{b::{c::*}};
+use a::{b::{c::{}}};
+use a::{b::{c::d}};
+use a::{b::{c::{xxx, yyy, zzz}}};
+
+// #2645
+/// This line is not affected.
+// This line is deleted.
+use c;
+
+// #2670
+#[macro_use]
+use imports_with_attr;
+
+// #2888
+use std::f64::consts::{SQRT_2, E, PI};
+
+// #3273
+#[rustfmt::skip]
+use std::fmt::{self, {Display, Formatter}};