Parser: recover from `:::` to `::`

3 files changed, 192 insertions, 0 deletions

diff --git a/tests/ui/parser/triple-colon.fixed b/tests/ui/parser/triple-colon.fixed
new file mode 100644
index 00000000000..168e4c1f618
--- /dev/null
+++ b/tests/ui/parser/triple-colon.fixed
@@ -0,0 +1,23 @@
+//@ run-rustfix
+
+#![allow(unused)]
+
+use ::std::{cell as _}; //~ ERROR path separator must be a double colon
+use std::cell::*; //~ ERROR path separator must be a double colon
+use std::cell::Cell; //~ ERROR path separator must be a double colon
+use std::{cell as _}; //~ ERROR path separator must be a double colon
+
+mod foo{
+    use ::{}; //~ ERROR path separator must be a double colon
+    use ::*; //~ ERROR path separator must be a double colon
+}
+
+fn main() {
+    let c: ::std::cell::Cell::<u8> = Cell::<u8>::new(0);
+    //~^ ERROR path separator must be a double colon
+    //~| ERROR path separator must be a double colon
+    //~| ERROR path separator must be a double colon
+    //~| ERROR path separator must be a double colon
+    //~| ERROR path separator must be a double colon
+    //~| ERROR path separator must be a double colon
+}
diff --git a/tests/ui/parser/triple-colon.rs b/tests/ui/parser/triple-colon.rs
new file mode 100644
index 00000000000..1a70012685f
--- /dev/null
+++ b/tests/ui/parser/triple-colon.rs
@@ -0,0 +1,23 @@
+//@ run-rustfix
+
+#![allow(unused)]
+
+use :::std::{cell as _}; //~ ERROR path separator must be a double colon
+use std::cell:::*; //~ ERROR path separator must be a double colon
+use std::cell:::Cell; //~ ERROR path separator must be a double colon
+use std:::{cell as _}; //~ ERROR path separator must be a double colon
+
+mod foo{
+    use :::{}; //~ ERROR path separator must be a double colon
+    use :::*; //~ ERROR path separator must be a double colon
+}
+
+fn main() {
+    let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+    //~^ ERROR path separator must be a double colon
+    //~| ERROR path separator must be a double colon
+    //~| ERROR path separator must be a double colon
+    //~| ERROR path separator must be a double colon
+    //~| ERROR path separator must be a double colon
+    //~| ERROR path separator must be a double colon
+}
diff --git a/tests/ui/parser/triple-colon.stderr b/tests/ui/parser/triple-colon.stderr
new file mode 100644
index 00000000000..8d57fd7ebc9
--- /dev/null
+++ b/tests/ui/parser/triple-colon.stderr
@@ -0,0 +1,146 @@
+error: path separator must be a double colon
+  --> $DIR/triple-colon.rs:5:7
+   |
+LL | use :::std::{cell as _};
+   |       ^
+   |
+help: use a double colon instead
+   |
+LL - use :::std::{cell as _};
+LL + use ::std::{cell as _};
+   |
+
+error: path separator must be a double colon
+  --> $DIR/triple-colon.rs:6:16
+   |
+LL | use std::cell:::*;
+   |                ^
+   |
+help: use a double colon instead
+   |
+LL - use std::cell:::*;
+LL + use std::cell::*;
+   |
+
+error: path separator must be a double colon
+  --> $DIR/triple-colon.rs:7:16
+   |
+LL | use std::cell:::Cell;
+   |                ^
+   |
+help: use a double colon instead
+   |
+LL - use std::cell:::Cell;
+LL + use std::cell::Cell;
+   |
+
+error: path separator must be a double colon
+  --> $DIR/triple-colon.rs:8:10
+   |
+LL | use std:::{cell as _};
+   |          ^
+   |
+help: use a double colon instead
+   |
+LL - use std:::{cell as _};
+LL + use std::{cell as _};
+   |
+
+error: path separator must be a double colon
+  --> $DIR/triple-colon.rs:11:11
+   |
+LL |     use :::{};
+   |           ^
+   |
+help: use a double colon instead
+   |
+LL -     use :::{};
+LL +     use ::{};
+   |
+
+error: path separator must be a double colon
+  --> $DIR/triple-colon.rs:12:11
+   |
+LL |     use :::*;
+   |           ^
+   |
+help: use a double colon instead
+   |
+LL -     use :::*;
+LL +     use ::*;
+   |
+
+error: path separator must be a double colon
+  --> $DIR/triple-colon.rs:16:14
+   |
+LL |     let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+   |              ^
+   |
+help: use a double colon instead
+   |
+LL -     let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+LL +     let c: ::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+   |
+
+error: path separator must be a double colon
+  --> $DIR/triple-colon.rs:16:20
+   |
+LL |     let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+   |                    ^
+   |
+help: use a double colon instead
+   |
+LL -     let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+LL +     let c: :::std::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+   |
+
+error: path separator must be a double colon
+  --> $DIR/triple-colon.rs:16:27
+   |
+LL |     let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+   |                           ^
+   |
+help: use a double colon instead
+   |
+LL -     let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+LL +     let c: :::std:::cell::Cell:::<u8> = Cell:::<u8>:::new(0);
+   |
+
+error: path separator must be a double colon
+  --> $DIR/triple-colon.rs:16:34
+   |
+LL |     let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+   |                                  ^
+   |
+help: use a double colon instead
+   |
+LL -     let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+LL +     let c: :::std:::cell:::Cell::<u8> = Cell:::<u8>:::new(0);
+   |
+
+error: path separator must be a double colon
+  --> $DIR/triple-colon.rs:16:48
+   |
+LL |     let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+   |                                                ^
+   |
+help: use a double colon instead
+   |
+LL -     let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+LL +     let c: :::std:::cell:::Cell:::<u8> = Cell::<u8>:::new(0);
+   |
+
+error: path separator must be a double colon
+  --> $DIR/triple-colon.rs:16:55
+   |
+LL |     let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+   |                                                       ^
+   |
+help: use a double colon instead
+   |
+LL -     let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>:::new(0);
+LL +     let c: :::std:::cell:::Cell:::<u8> = Cell:::<u8>::new(0);
+   |
+
+error: aborting due to 12 previous errors
+