Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

16 files changed, 305 insertions, 0 deletions

diff --git a/tests/ui/closures/binder/async-closure-with-binder.rs b/tests/ui/closures/binder/async-closure-with-binder.rs
new file mode 100644
index 000000000..4fa599d37
--- /dev/null
+++ b/tests/ui/closures/binder/async-closure-with-binder.rs
@@ -0,0 +1,8 @@
+// edition:2021
+#![feature(closure_lifetime_binder)]
+#![feature(async_closure)]
+fn main() {
+    for<'a> async || ();
+    //~^ ERROR `for<...>` binders on `async` closures are not currently supported
+    //~^^ ERROR implicit types in closure signatures are forbidden when `for<...>` is present
+}
diff --git a/tests/ui/closures/binder/async-closure-with-binder.stderr b/tests/ui/closures/binder/async-closure-with-binder.stderr
new file mode 100644
index 000000000..1d4628b1a
--- /dev/null
+++ b/tests/ui/closures/binder/async-closure-with-binder.stderr
@@ -0,0 +1,16 @@
+error: `for<...>` binders on `async` closures are not currently supported
+  --> $DIR/async-closure-with-binder.rs:5:5
+   |
+LL |     for<'a> async || ();
+   |     ^^^^^^^
+
+error: implicit types in closure signatures are forbidden when `for<...>` is present
+  --> $DIR/async-closure-with-binder.rs:5:5
+   |
+LL |     for<'a> async || ();
+   |     -------^^^^^^^^^
+   |     |
+   |     `for<...>` is here
+
+error: aborting due to 2 previous errors
+
diff --git a/tests/ui/closures/binder/disallow-const.rs b/tests/ui/closures/binder/disallow-const.rs
new file mode 100644
index 000000000..72ad6185d
--- /dev/null
+++ b/tests/ui/closures/binder/disallow-const.rs
@@ -0,0 +1,6 @@
+#![feature(closure_lifetime_binder)]
+
+fn main() {
+    for<const N: i32> || -> () {};
+    //~^ ERROR only lifetime parameters can be used in this context
+}
diff --git a/tests/ui/closures/binder/disallow-const.stderr b/tests/ui/closures/binder/disallow-const.stderr
new file mode 100644
index 000000000..3c3b43d8c
--- /dev/null
+++ b/tests/ui/closures/binder/disallow-const.stderr
@@ -0,0 +1,8 @@
+error: only lifetime parameters can be used in this context
+  --> $DIR/disallow-const.rs:4:15
+   |
+LL |     for<const N: i32> || -> () {};
+   |               ^
+
+error: aborting due to previous error
+
diff --git a/tests/ui/closures/binder/disallow-ty.rs b/tests/ui/closures/binder/disallow-ty.rs
new file mode 100644
index 000000000..bbe3d8488
--- /dev/null
+++ b/tests/ui/closures/binder/disallow-ty.rs
@@ -0,0 +1,6 @@
+#![feature(closure_lifetime_binder)]
+
+fn main() {
+    for<T> || -> () {};
+    //~^ ERROR only lifetime parameters can be used in this context
+}
diff --git a/tests/ui/closures/binder/disallow-ty.stderr b/tests/ui/closures/binder/disallow-ty.stderr
new file mode 100644
index 000000000..51b6773ed
--- /dev/null
+++ b/tests/ui/closures/binder/disallow-ty.stderr
@@ -0,0 +1,8 @@
+error: only lifetime parameters can be used in this context
+  --> $DIR/disallow-ty.rs:4:9
+   |
+LL |     for<T> || -> () {};
+   |         ^
+
+error: aborting due to previous error
+
diff --git a/tests/ui/closures/binder/implicit-return.rs b/tests/ui/closures/binder/implicit-return.rs
new file mode 100644
index 000000000..d34e5721d
--- /dev/null
+++ b/tests/ui/closures/binder/implicit-return.rs
@@ -0,0 +1,6 @@
+#![feature(closure_lifetime_binder)]
+
+fn main() {
+    let _f = for<'a> |_: &'a ()| {};
+    //~^ implicit types in closure signatures are forbidden when `for<...>` is present
+}
diff --git a/tests/ui/closures/binder/implicit-return.stderr b/tests/ui/closures/binder/implicit-return.stderr
new file mode 100644
index 000000000..5bfb97113
--- /dev/null
+++ b/tests/ui/closures/binder/implicit-return.stderr
@@ -0,0 +1,10 @@
+error: implicit types in closure signatures are forbidden when `for<...>` is present
+  --> $DIR/implicit-return.rs:4:34
+   |
+LL |     let _f = for<'a> |_: &'a ()| {};
+   |              -------             ^
+   |              |
+   |              `for<...>` is here
+
+error: aborting due to previous error
+
diff --git a/tests/ui/closures/binder/implicit-stuff.rs b/tests/ui/closures/binder/implicit-stuff.rs
new file mode 100644
index 000000000..09e4c747a
--- /dev/null
+++ b/tests/ui/closures/binder/implicit-stuff.rs
@@ -0,0 +1,27 @@
+#![feature(closure_lifetime_binder)]
+
+fn main() {
+    // Implicit types
+    let _ = for<> || {};                                      //~ ERROR implicit types in closure signatures are forbidden when `for<...>` is present
+    let _ = for<'a> || -> &'a _ { &() };                      //~ ERROR implicit types in closure signatures are forbidden when `for<...>` is present
+    let _ = for<'a> |x| -> &'a () { x };                      //~ ERROR implicit types in closure signatures are forbidden when `for<...>` is present
+    let _ = for<'a> |x: &'a _| -> &'a () { x };               //~ ERROR implicit types in closure signatures are forbidden when `for<...>` is present
+    let _ = for<'a> |x: &'a Vec::<_>| -> &'a Vec::<()> { x }; //~ ERROR implicit types in closure signatures are forbidden when `for<...>` is present
+    let _ = for<'a> |x: &'a Vec<()>| -> &'a Vec<_> { x };     //~ ERROR implicit types in closure signatures are forbidden when `for<...>` is present
+    let _ = for<'a> |x: &'a _| -> &'a &'a () { x };           //~ ERROR implicit types in closure signatures are forbidden when `for<...>` is present
+    let _ = for<'a> |x: &'a _, y, z: _| -> &'a _ {            //~ ERROR implicit types in closure signatures are forbidden when `for<...>` is present
+        let _: &u8 = x;
+        let _: u32 = y;
+        let _: i32 = z;
+        x
+    };
+
+    // Lifetime elision
+    let _ = for<> |_: &()| -> () {};           //~ ERROR `&` without an explicit lifetime name cannot be used here
+    let _ = for<> |x: &()| -> &() { x };       //~ ERROR `&` without an explicit lifetime name cannot be used here
+                                               //~| ERROR `&` without an explicit lifetime name cannot be used here
+    let _ = for<> |x: &'_ ()| -> &'_ () { x }; //~ ERROR `'_` cannot be used here
+                                               //~| ERROR `'_` cannot be used here
+    let _ = for<'a> |x: &()| -> &'a () { x };  //~ ERROR `&` without an explicit lifetime name cannot be used here
+    let _ = for<'a> |x: &'a ()| -> &() { x };  //~ ERROR `&` without an explicit lifetime name cannot be used here
+}
diff --git a/tests/ui/closures/binder/implicit-stuff.stderr b/tests/ui/closures/binder/implicit-stuff.stderr
new file mode 100644
index 000000000..779a08a44
--- /dev/null
+++ b/tests/ui/closures/binder/implicit-stuff.stderr
@@ -0,0 +1,107 @@
+error[E0637]: `&` without an explicit lifetime name cannot be used here
+  --> $DIR/implicit-stuff.rs:20:23
+   |
+LL |     let _ = for<> |_: &()| -> () {};
+   |                       ^ explicit lifetime name needed here
+
+error[E0637]: `&` without an explicit lifetime name cannot be used here
+  --> $DIR/implicit-stuff.rs:21:23
+   |
+LL |     let _ = for<> |x: &()| -> &() { x };
+   |                       ^ explicit lifetime name needed here
+
+error[E0637]: `&` without an explicit lifetime name cannot be used here
+  --> $DIR/implicit-stuff.rs:21:31
+   |
+LL |     let _ = for<> |x: &()| -> &() { x };
+   |                               ^ explicit lifetime name needed here
+
+error[E0637]: `'_` cannot be used here
+  --> $DIR/implicit-stuff.rs:23:24
+   |
+LL |     let _ = for<> |x: &'_ ()| -> &'_ () { x };
+   |                        ^^ `'_` is a reserved lifetime name
+
+error[E0637]: `'_` cannot be used here
+  --> $DIR/implicit-stuff.rs:23:35
+   |
+LL |     let _ = for<> |x: &'_ ()| -> &'_ () { x };
+   |                                   ^^ `'_` is a reserved lifetime name
+
+error[E0637]: `&` without an explicit lifetime name cannot be used here
+  --> $DIR/implicit-stuff.rs:25:25
+   |
+LL |     let _ = for<'a> |x: &()| -> &'a () { x };
+   |                         ^ explicit lifetime name needed here
+
+error[E0637]: `&` without an explicit lifetime name cannot be used here
+  --> $DIR/implicit-stuff.rs:26:36
+   |
+LL |     let _ = for<'a> |x: &'a ()| -> &() { x };
+   |                                    ^ explicit lifetime name needed here
+
+error: implicit types in closure signatures are forbidden when `for<...>` is present
+  --> $DIR/implicit-stuff.rs:5:22
+   |
+LL |     let _ = for<> || {};
+   |             -----    ^
+   |             |
+   |             `for<...>` is here
+
+error: implicit types in closure signatures are forbidden when `for<...>` is present
+  --> $DIR/implicit-stuff.rs:6:31
+   |
+LL |     let _ = for<'a> || -> &'a _ { &() };
+   |             -------           ^
+   |             |
+   |             `for<...>` is here
+
+error: implicit types in closure signatures are forbidden when `for<...>` is present
+  --> $DIR/implicit-stuff.rs:7:22
+   |
+LL |     let _ = for<'a> |x| -> &'a () { x };
+   |             -------  ^
+   |             |
+   |             `for<...>` is here
+
+error: implicit types in closure signatures are forbidden when `for<...>` is present
+  --> $DIR/implicit-stuff.rs:8:29
+   |
+LL |     let _ = for<'a> |x: &'a _| -> &'a () { x };
+   |             -------         ^
+   |             |
+   |             `for<...>` is here
+
+error: implicit types in closure signatures are forbidden when `for<...>` is present
+  --> $DIR/implicit-stuff.rs:9:35
+   |
+LL |     let _ = for<'a> |x: &'a Vec::<_>| -> &'a Vec::<()> { x };
+   |             -------               ^
+   |             |
+   |             `for<...>` is here
+
+error: implicit types in closure signatures are forbidden when `for<...>` is present
+  --> $DIR/implicit-stuff.rs:10:49
+   |
+LL |     let _ = for<'a> |x: &'a Vec<()>| -> &'a Vec<_> { x };
+   |             ------- `for<...>` is here          ^
+
+error: implicit types in closure signatures are forbidden when `for<...>` is present
+  --> $DIR/implicit-stuff.rs:11:29
+   |
+LL |     let _ = for<'a> |x: &'a _| -> &'a &'a () { x };
+   |             -------         ^
+   |             |
+   |             `for<...>` is here
+
+error: implicit types in closure signatures are forbidden when `for<...>` is present
+  --> $DIR/implicit-stuff.rs:12:29
+   |
+LL |     let _ = for<'a> |x: &'a _, y, z: _| -> &'a _ {
+   |             -------         ^  ^     ^         ^
+   |             |
+   |             `for<...>` is here
+
+error: aborting due to 15 previous errors
+
+For more information about this error, try `rustc --explain E0637`.
diff --git a/tests/ui/closures/binder/late-bound-in-body.rs b/tests/ui/closures/binder/late-bound-in-body.rs
new file mode 100644
index 000000000..bb5c7552f
--- /dev/null
+++ b/tests/ui/closures/binder/late-bound-in-body.rs
@@ -0,0 +1,9 @@
+// check-pass
+
+#![feature(closure_lifetime_binder)]
+
+fn main() {
+    let _ = for<'a> || -> () {
+        let _: &'a bool = &true;
+    };
+}
diff --git a/tests/ui/closures/binder/nested-closures-regions.rs b/tests/ui/closures/binder/nested-closures-regions.rs
new file mode 100644
index 000000000..6bfc6c80b
--- /dev/null
+++ b/tests/ui/closures/binder/nested-closures-regions.rs
@@ -0,0 +1,9 @@
+// check-pass
+
+#![feature(closure_lifetime_binder)]
+#![feature(rustc_attrs)]
+
+#[rustc_regions]
+fn main() {
+    for<'a> || -> () { for<'c> |_: &'a ()| -> () {}; };
+}
diff --git a/tests/ui/closures/binder/nested-closures-regions.stderr b/tests/ui/closures/binder/nested-closures-regions.stderr
new file mode 100644
index 000000000..b385e0ed6
--- /dev/null
+++ b/tests/ui/closures/binder/nested-closures-regions.stderr
@@ -0,0 +1,38 @@
+note: external requirements
+  --> $DIR/nested-closures-regions.rs:8:24
+   |
+LL |     for<'a> || -> () { for<'c> |_: &'a ()| -> () {}; };
+   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: defining type: main::{closure#0}::{closure#0} with closure substs [
+               i8,
+               extern "rust-call" fn((&(),)),
+               (),
+           ]
+   = note: late-bound region is '_#4r
+   = note: late-bound region is '_#2r
+   = note: number of external vids: 3
+   = note: where '_#1r: '_#2r
+   = note: where '_#2r: '_#1r
+
+note: no external requirements
+  --> $DIR/nested-closures-regions.rs:8:5
+   |
+LL |     for<'a> || -> () { for<'c> |_: &'a ()| -> () {}; };
+   |     ^^^^^^^^^^^^^^^^
+   |
+   = note: defining type: main::{closure#0} with closure substs [
+               i8,
+               extern "rust-call" fn(()),
+               (),
+           ]
+   = note: late-bound region is '_#2r
+
+note: no external requirements
+  --> $DIR/nested-closures-regions.rs:7:1
+   |
+LL | fn main() {
+   | ^^^^^^^^^
+   |
+   = note: defining type: main
+
diff --git a/tests/ui/closures/binder/nested-closures.rs b/tests/ui/closures/binder/nested-closures.rs
new file mode 100644
index 000000000..b3c36e7ee
--- /dev/null
+++ b/tests/ui/closures/binder/nested-closures.rs
@@ -0,0 +1,7 @@
+// check-pass
+
+#![feature(closure_lifetime_binder)]
+
+fn main() {
+    for<'a> || -> () { for<'c> |_: &'a ()| -> () {}; };
+}
diff --git a/tests/ui/closures/binder/suggestion-for-introducing-lifetime-into-binder.rs b/tests/ui/closures/binder/suggestion-for-introducing-lifetime-into-binder.rs
new file mode 100644
index 000000000..b476dd50c
--- /dev/null
+++ b/tests/ui/closures/binder/suggestion-for-introducing-lifetime-into-binder.rs
@@ -0,0 +1,7 @@
+#![feature(closure_lifetime_binder)]
+fn main() {
+    for<> |_: &'a ()| -> () {};
+    //~^ ERROR use of undeclared lifetime name `'a`
+    for<'a> |_: &'b ()| -> () {};
+    //~^ ERROR use of undeclared lifetime name `'b`
+}
diff --git a/tests/ui/closures/binder/suggestion-for-introducing-lifetime-into-binder.stderr b/tests/ui/closures/binder/suggestion-for-introducing-lifetime-into-binder.stderr
new file mode 100644
index 000000000..1381acc15
--- /dev/null
+++ b/tests/ui/closures/binder/suggestion-for-introducing-lifetime-into-binder.stderr
@@ -0,0 +1,33 @@
+error[E0261]: use of undeclared lifetime name `'a`
+  --> $DIR/suggestion-for-introducing-lifetime-into-binder.rs:3:16
+   |
+LL |     for<> |_: &'a ()| -> () {};
+   |                ^^ undeclared lifetime
+   |
+help: consider introducing lifetime `'a` here
+   |
+LL |     for<'a, > |_: &'a ()| -> () {};
+   |         +++
+help: consider introducing lifetime `'a` here
+   |
+LL | fn main<'a>() {
+   |        ++++
+
+error[E0261]: use of undeclared lifetime name `'b`
+  --> $DIR/suggestion-for-introducing-lifetime-into-binder.rs:5:18
+   |
+LL |     for<'a> |_: &'b ()| -> () {};
+   |                  ^^ undeclared lifetime
+   |
+help: consider introducing lifetime `'b` here
+   |
+LL |     for<'b, 'a> |_: &'b ()| -> () {};
+   |         +++
+help: consider introducing lifetime `'b` here
+   |
+LL | fn main<'b>() {
+   |        ++++
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0261`.