Fix fn_sig_for_fn_abi and the coroutine transform for generators

There were three issues previously:
* The self argument was pinned, despite Iterator::next taking an
  unpinned mutable reference.
* A resume argument was passed, despite Iterator::next not having one.
* The return value was CoroutineState<Item, ()> rather than Option<Item>

While these things just so happened to work with the LLVM backend,
cg_clif does much stricter checks when trying to assign a value to a
place. In addition it can't handle the mismatch between the amount of
arguments specified by the FnAbi and the FnSig.

Author: bjorn3

build_system/tests.rs

@@ -100,6 +100,15 @@ const BASE_SYSROOT_SUITE: &[TestCase] = &[
     TestCase::build_bin_and_run("aot.issue-72793", "example/issue-72793.rs", &[]),
     TestCase::build_bin("aot.issue-59326", "example/issue-59326.rs"),
     TestCase::build_bin_and_run("aot.neon", "example/neon.rs", &[]),
+    TestCase::custom("aot.gen_block_iterate", &|runner| {
+        runner.run_rustc([
+            "example/gen_block_iterate.rs",
+            "--edition",
+            "2024",
+            "-Zunstable-options",
+        ]);
+        runner.run_out_command("gen_block_iterate", &[]);
+    }),
 ];
 
 pub(crate) static RAND_REPO: GitRepo = GitRepo::github(

config.txt

@@ -43,6 +43,7 @@ aot.mod_bench
 aot.issue-72793
 aot.issue-59326
 aot.neon
+aot.gen_block_iterate
 
 testsuite.extended_sysroot
 test.rust-random/rand

example/gen_block_iterate.rs

@@ -0,0 +1,36 @@
+// Copied from https://github.com/rust-lang/rust/blob/46455dc65069387f2dc46612f13fd45452ab301a/tests/ui/coroutine/gen_block_iterate.rs
+// revisions: next old
+//compile-flags: --edition 2024 -Zunstable-options
+//[next] compile-flags: -Ztrait-solver=next
+// run-pass
+#![feature(gen_blocks)]
+
+fn foo() -> impl Iterator<Item = u32> {
+    gen { yield 42; for x in 3..6 { yield x } }
+}
+
+fn moved() -> impl Iterator<Item = u32> {
+    let mut x = "foo".to_string();
+    gen move {
+        yield 42;
+        if x == "foo" { return }
+        x.clear();
+        for x in 3..6 { yield x }
+    }
+}
+
+fn main() {
+    let mut iter = foo();
+    assert_eq!(iter.next(), Some(42));
+    assert_eq!(iter.next(), Some(3));
+    assert_eq!(iter.next(), Some(4));
+    assert_eq!(iter.next(), Some(5));
+    assert_eq!(iter.next(), None);
+    // `gen` blocks are fused
+    assert_eq!(iter.next(), None);
+
+    let mut iter = moved();
+    assert_eq!(iter.next(), Some(42));
+    assert_eq!(iter.next(), None);
+
+}

rustfmt.toml

@@ -1,4 +1,7 @@
-ignore = ["y.rs"]
+ignore = [
+    "y.rs",
+    "example/gen_block_iterate.rs", # uses edition 2024
+]
 
 # Matches rustfmt.toml of rustc
 version = "Two"