Auto merge of #45773 - Badel2:dotdoteq, r=petrochenkov

Add error for `...` in expressions

Follow-up to https://github.com/rust-lang/rust/pull/44709
Tracking issue: https://github.com/rust-lang/rust/issues/28237

* Using `...` in expressions was a warning, now it's an error
* The error message suggests using `..` or `..=` instead, and explains the difference
* Updated remaining occurrences of `...` to `..=`

r? petrochenkov

1 files changed, 38 insertions, 0 deletions

diff --git a/src/test/parse-fail/range_inclusive_dotdotdot.rs b/src/test/parse-fail/range_inclusive_dotdotdot.rs
new file mode 100644
index 00000000000..a4c36a2f0ba
--- /dev/null
+++ b/src/test/parse-fail/range_inclusive_dotdotdot.rs
@@ -0,0 +1,38 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// compile-flags: -Z parse-only -Z continue-parse-after-error
+
+// Make sure that inclusive ranges with `...` syntax don't parse.
+
+#![feature(inclusive_range_syntax, inclusive_range)]
+
+use std::ops::RangeToInclusive;
+
+fn return_range_to() -> RangeToInclusive<i32> {
+    return ...1; //~ERROR `...` syntax cannot be used in expressions
+                 //~^HELP  Use `..` if you need an exclusive range (a < b)
+                 //~^^HELP or `..=` if you need an inclusive range (a <= b)
+}
+
+pub fn main() {
+    let x = ...0;    //~ERROR `...` syntax cannot be used in expressions
+                     //~^HELP  Use `..` if you need an exclusive range (a < b)
+                     //~^^HELP or `..=` if you need an inclusive range (a <= b)
+
+    let x = 5...5;   //~ERROR `...` syntax cannot be used in expressions
+                     //~^HELP  Use `..` if you need an exclusive range (a < b)
+                     //~^^HELP or `..=` if you need an inclusive range (a <= b)
+
+    for _ in 0...1 {} //~ERROR `...` syntax cannot be used in expressions
+                     //~^HELP  Use `..` if you need an exclusive range (a < b)
+                     //~^^HELP or `..=` if you need an inclusive range (a <= b)
+}
+