Auto merge of #55704 - Nemo157:pinned-generators, r=Zoxc

Use pinning for generators to make trait safe

I'm unsure whether there needs to be any changes to the actual generator transform. Tests are passing so the fact that `Pin<&mut T>` is fundamentally the same as `&mut T` seems to allow it to still work, but maybe there's something subtle here that could go wrong.

This is specified in [RFC 2349 § Immovable generators](https://github.com/rust-lang/rfcs/blob/master/text/2349-pin.md#immovable-generators) (although, since that RFC it has become safe to create an immovable generator, and instead it's unsafe to resume any generator; with these changes both are now safe and instead the unsafety is moved to creating a `Pin<&mut [static generator]>` which there are safe APIs for).

CC #43122

1 files changed, 36 insertions, 0 deletions

diff --git a/src/test/debuginfo/generators.rs b/src/test/debuginfo/generators.rs
new file mode 100644
index 00000000000..b56d222e0e0
--- /dev/null
+++ b/src/test/debuginfo/generators.rs
@@ -0,0 +1,36 @@
+// min-lldb-version: 310
+
+// compile-flags:-g
+
+// === GDB TESTS ===================================================================================
+
+// gdb-command:run
+// gdb-command:print a
+// gdb-check:$1 = 5
+
+// === LLDB TESTS ==================================================================================
+
+// lldb-command:run
+// lldb-command:print a
+// lldbg-check:(int) $0 = 5
+// lldbr-check:(int) a = 5
+
+#![feature(omit_gdb_pretty_printer_section, generators, generator_trait, pin)]
+#![omit_gdb_pretty_printer_section]
+
+use std::ops::Generator;
+use std::pin::Pin;
+
+fn main() {
+    let mut a = 5;
+    let mut b = || {
+        yield;
+        _zzz(); // #break
+        a = 6;
+    };
+    Pin::new(&mut b).resume();
+    Pin::new(&mut b).resume();
+    _zzz(); // #break
+}
+
+fn _zzz() {()}