diff --git a/test/cases/compile_errors/async/Frame_of_generic_function.zig b/test/cases/compile_errors/async/Frame_of_generic_function.zig
new file mode 100644
index 0000000000000000000000000000000000000000..d90e53eb4683dba5f55a8e99388d04f47aa91390
--- /dev/null
+++ b/test/cases/compile_errors/async/Frame_of_generic_function.zig
@@ -0,0 +1,14 @@
+export fn entry() void {
+    var frame: @Frame(func) = undefined;
+    _ = frame;
+}
+fn func(comptime T: type) void {
+    var x: T = undefined;
+    _ = x;
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:2:16: error: @Frame() of generic function
diff --git a/test/cases/compile_errors/async/async_function_depends_on_its_own_frame.zig b/test/cases/compile_errors/async/async_function_depends_on_its_own_frame.zig
new file mode 100644
index 0000000000000000000000000000000000000000..4dde5860bafc4709d376e1703df95b14ce58420f
--- /dev/null
+++ b/test/cases/compile_errors/async/async_function_depends_on_its_own_frame.zig
@@ -0,0 +1,13 @@
+export fn entry() void {
+    _ = async amain();
+}
+fn amain() callconv(.Async) void {
+    var x: [@sizeOf(@Frame(amain))]u8 = undefined;
+    _ = x;
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:4:1: error: cannot resolve '@Frame(amain)': function not fully analyzed yet
diff --git a/test/cases/compile_errors/async/async_function_indirectly_depends_on_its_own_frame.zig b/test/cases/compile_errors/async/async_function_indirectly_depends_on_its_own_frame.zig
new file mode 100644
index 0000000000000000000000000000000000000000..4dac0d4fa33fbc45db20184af0c0734552b9df81
--- /dev/null
+++ b/test/cases/compile_errors/async/async_function_indirectly_depends_on_its_own_frame.zig
@@ -0,0 +1,17 @@
+export fn entry() void {
+    _ = async amain();
+}
+fn amain() callconv(.Async) void {
+    other();
+}
+fn other() void {
+    var x: [@sizeOf(@Frame(amain))]u8 = undefined;
+    _ = x;
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:4:1: error: unable to determine async function frame of 'amain'
+// tmp.zig:5:10: note: analysis of function 'other' depends on the frame
diff --git a/test/cases/compile_errors/async/bad_alignment_in_asynccall.zig b/test/cases/compile_errors/async/bad_alignment_in_asynccall.zig
new file mode 100644
index 0000000000000000000000000000000000000000..399914000994b76b44c91e8200b74dafcd7aa1be
--- /dev/null
+++ b/test/cases/compile_errors/async/bad_alignment_in_asynccall.zig
@@ -0,0 +1,12 @@
+export fn entry() void {
+    var ptr: fn () callconv(.Async) void = func;
+    var bytes: [64]u8 = undefined;
+    _ = @asyncCall(&bytes, {}, ptr, .{});
+}
+fn func() callconv(.Async) void {}
+
+// error
+// backend=stage1
+// target=aarch64-linux-none
+//
+// tmp.zig:4:21: error: expected type '[]align(8) u8', found '*[64]u8'
diff --git a/test/cases/compile_errors/async/const_frame_cast_to_anyframe.zig b/test/cases/compile_errors/async/const_frame_cast_to_anyframe.zig
new file mode 100644
index 0000000000000000000000000000000000000000..affdb953d72f317ea094a806b6c08aa05c135256
--- /dev/null
+++ b/test/cases/compile_errors/async/const_frame_cast_to_anyframe.zig
@@ -0,0 +1,19 @@
+export fn a() void {
+    const f = async func();
+    resume f;
+}
+export fn b() void {
+    const f = async func();
+    var x: anyframe = &f;
+    _ = x;
+}
+fn func() void {
+    suspend {}
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:3:12: error: expected type 'anyframe', found '*const @Frame(func)'
+// tmp.zig:7:24: error: expected type 'anyframe', found '*const @Frame(func)'
diff --git a/test/cases/compile_errors/async/exported_async_function.zig b/test/cases/compile_errors/async/exported_async_function.zig
new file mode 100644
index 0000000000000000000000000000000000000000..b9ac591227d95ea9cf01595a357c97d4e00950fb
--- /dev/null
+++ b/test/cases/compile_errors/async/exported_async_function.zig
@@ -0,0 +1,7 @@
+export fn foo() callconv(.Async) void {}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:1:1: error: exported function cannot be async
diff --git a/test/cases/compile_errors/async/frame_called_outside_of_function_definition.zig b/test/cases/compile_errors/async/frame_called_outside_of_function_definition.zig
new file mode 100644
index 0000000000000000000000000000000000000000..d14099815287f35321510c87104e0a5831a970a6
--- /dev/null
+++ b/test/cases/compile_errors/async/frame_called_outside_of_function_definition.zig
@@ -0,0 +1,11 @@
+var handle_undef: anyframe = undefined;
+var handle_dummy: anyframe = @frame();
+export fn entry() bool {
+    return handle_undef == handle_dummy;
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:2:30: error: @frame() called outside of function definition
diff --git a/test/cases/compile_errors/async/frame_causes_function_to_be_async.zig b/test/cases/compile_errors/async/frame_causes_function_to_be_async.zig
new file mode 100644
index 0000000000000000000000000000000000000000..f8493b08b2c9e3374ee9c5c8297601c397964dea
--- /dev/null
+++ b/test/cases/compile_errors/async/frame_causes_function_to_be_async.zig
@@ -0,0 +1,13 @@
+export fn entry() void {
+    func();
+}
+fn func() void {
+    _ = @frame();
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:1:1: error: function with calling convention 'C' cannot be async
+// tmp.zig:5:9: note: @frame() causes function to be async
diff --git a/test/cases/compile_errors/async/function_with_ccc_indirectly_calling_async_function.zig b/test/cases/compile_errors/async/function_with_ccc_indirectly_calling_async_function.zig
new file mode 100644
index 0000000000000000000000000000000000000000..9fadb992b4c68407ab3c65c208d968b29123bf7a
--- /dev/null
+++ b/test/cases/compile_errors/async/function_with_ccc_indirectly_calling_async_function.zig
@@ -0,0 +1,18 @@
+export fn entry() void {
+    foo();
+}
+fn foo() void {
+    bar();
+}
+fn bar() void {
+    suspend {}
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:1:1: error: function with calling convention 'C' cannot be async
+// tmp.zig:2:8: note: async function call here
+// tmp.zig:5:8: note: async function call here
+// tmp.zig:8:5: note: suspends here
diff --git a/test/cases/compile_errors/async/indirect_recursion_of_async_functions_detected.zig b/test/cases/compile_errors/async/indirect_recursion_of_async_functions_detected.zig
new file mode 100644
index 0000000000000000000000000000000000000000..d845dc7930a73e4c85f24b57f9c6432a64bae4d3
--- /dev/null
+++ b/test/cases/compile_errors/async/indirect_recursion_of_async_functions_detected.zig
@@ -0,0 +1,36 @@
+var frame: ?anyframe = null;
+
+export fn a() void {
+    _ = async rangeSum(10);
+    while (frame) |f| resume f;
+}
+
+fn rangeSum(x: i32) i32 {
+    suspend {
+        frame = @frame();
+    }
+    frame = null;
+
+    if (x == 0) return 0;
+    var child = rangeSumIndirect(x - 1);
+    return child + 1;
+}
+
+fn rangeSumIndirect(x: i32) i32 {
+    suspend {
+        frame = @frame();
+    }
+    frame = null;
+
+    if (x == 0) return 0;
+    var child = rangeSum(x - 1);
+    return child + 1;
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:8:1: error: '@Frame(rangeSum)' depends on itself
+// tmp.zig:15:33: note: when analyzing type '@Frame(rangeSum)' here
+// tmp.zig:26:25: note: when analyzing type '@Frame(rangeSumIndirect)' here
diff --git a/test/cases/compile_errors/async/invalid_suspend_in_exported_function.zig b/test/cases/compile_errors/async/invalid_suspend_in_exported_function.zig
new file mode 100644
index 0000000000000000000000000000000000000000..cfcbfba889dfd57b1260ee14df08d354f4973de4
--- /dev/null
+++ b/test/cases/compile_errors/async/invalid_suspend_in_exported_function.zig
@@ -0,0 +1,15 @@
+export fn entry() void {
+    var frame = async func();
+    var result = await frame;
+    _ = result;
+}
+fn func() void {
+    suspend {}
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:1:1: error: function with calling convention 'C' cannot be async
+// tmp.zig:3:18: note: await here is a suspend point
diff --git a/test/cases/compile_errors/async/non-async_function_pointer_eventually_is_inferred_to_become_async.zig b/test/cases/compile_errors/async/non-async_function_pointer_eventually_is_inferred_to_become_async.zig
new file mode 100644
index 0000000000000000000000000000000000000000..e18b4200289d80343d38cee2da9101f81916c0f5
--- /dev/null
+++ b/test/cases/compile_errors/async/non-async_function_pointer_eventually_is_inferred_to_become_async.zig
@@ -0,0 +1,15 @@
+export fn a() void {
+    var non_async_fn: fn () void = undefined;
+    non_async_fn = func;
+}
+fn func() void {
+    suspend {}
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:5:1: error: 'func' cannot be async
+// tmp.zig:3:20: note: required to be non-async here
+// tmp.zig:6:5: note: suspends here
diff --git a/test/cases/compile_errors/async/non_async_function_pointer_passed_to_asyncCall.zig b/test/cases/compile_errors/async/non_async_function_pointer_passed_to_asyncCall.zig
new file mode 100644
index 0000000000000000000000000000000000000000..d8ab4087e0a32dd2971c7bc51e3b662d30281bb0
--- /dev/null
+++ b/test/cases/compile_errors/async/non_async_function_pointer_passed_to_asyncCall.zig
@@ -0,0 +1,12 @@
+export fn entry() void {
+    var ptr = afunc;
+    var bytes: [100]u8 align(16) = undefined;
+    _ = @asyncCall(&bytes, {}, ptr, .{});
+}
+fn afunc() void { }
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:4:32: error: expected async function, found 'fn() void'
diff --git a/test/cases/compile_errors/async/prevent_bad_implicit_casting_of_anyframe_types.zig b/test/cases/compile_errors/async/prevent_bad_implicit_casting_of_anyframe_types.zig
new file mode 100644
index 0000000000000000000000000000000000000000..066bf1c1078762194d4d509fdf795a6362af8eff
--- /dev/null
+++ b/test/cases/compile_errors/async/prevent_bad_implicit_casting_of_anyframe_types.zig
@@ -0,0 +1,24 @@
+export fn a() void {
+    var x: anyframe = undefined;
+    var y: anyframe->i32 = x;
+    _ = y;
+}
+export fn b() void {
+    var x: i32 = undefined;
+    var y: anyframe->i32 = x;
+    _ = y;
+}
+export fn c() void {
+    var x: @Frame(func) = undefined;
+    var y: anyframe->i32 = &x;
+    _ = y;
+}
+fn func() void {}
+
+// error
+// backend=stage1
+// target=native
+//
+// :3:28: error: expected type 'anyframe->i32', found 'anyframe'
+// :8:28: error: expected type 'anyframe->i32', found 'i32'
+// tmp.zig:13:29: error: expected type 'anyframe->i32', found '*@Frame(func)'
\ No newline at end of file
diff --git a/test/cases/compile_errors/async/returning_error_from_void_async_function.zig b/test/cases/compile_errors/async/returning_error_from_void_async_function.zig
new file mode 100644
index 0000000000000000000000000000000000000000..691c89a3478e21324685d27680ec26c13b0fc5f2
--- /dev/null
+++ b/test/cases/compile_errors/async/returning_error_from_void_async_function.zig
@@ -0,0 +1,12 @@
+export fn entry() void {
+    _ = async amain();
+}
+fn amain() callconv(.Async) void {
+    return error.ShouldBeCompileError;
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:5:17: error: expected type 'void', found 'error{ShouldBeCompileError}'
diff --git a/test/cases/compile_errors/async/runtime-known_async_function_called.zig b/test/cases/compile_errors/async/runtime-known_async_function_called.zig
new file mode 100644
index 0000000000000000000000000000000000000000..90685ce566297391b6924ec1a56cddc2db28aa9a
--- /dev/null
+++ b/test/cases/compile_errors/async/runtime-known_async_function_called.zig
@@ -0,0 +1,14 @@
+export fn entry() void {
+    _ = async amain();
+}
+fn amain() void {
+    var ptr = afunc;
+    _ = ptr();
+}
+fn afunc() callconv(.Async) void {}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:6:12: error: function is not comptime-known; @asyncCall required
diff --git a/test/cases/compile_errors/async/runtime-known_function_called_with_async_keyword.zig b/test/cases/compile_errors/async/runtime-known_function_called_with_async_keyword.zig
new file mode 100644
index 0000000000000000000000000000000000000000..c66d0f9cbb557517b1e02bfd271871d2b229243e
--- /dev/null
+++ b/test/cases/compile_errors/async/runtime-known_function_called_with_async_keyword.zig
@@ -0,0 +1,12 @@
+export fn entry() void {
+    var ptr = afunc;
+    _ = async ptr();
+}
+
+fn afunc() callconv(.Async) void { }
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:3:15: error: function is not comptime-known; @asyncCall required
diff --git a/test/cases/compile_errors/async/wrong_frame_type_used_for_async_call.zig b/test/cases/compile_errors/async/wrong_frame_type_used_for_async_call.zig
new file mode 100644
index 0000000000000000000000000000000000000000..c02c20f495d8760272493a144f2054264cf474f6
--- /dev/null
+++ b/test/cases/compile_errors/async/wrong_frame_type_used_for_async_call.zig
@@ -0,0 +1,16 @@
+export fn entry() void {
+    var frame: @Frame(foo) = undefined;
+    frame = async bar();
+}
+fn foo() void {
+    suspend {}
+}
+fn bar() void {
+    suspend {}
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:3:13: error: expected type '*@Frame(bar)', found '*@Frame(foo)'
diff --git a/test/cases/compile_errors/async/wrong_type_for_argument_tuple_to_asyncCall.zig b/test/cases/compile_errors/async/wrong_type_for_argument_tuple_to_asyncCall.zig
new file mode 100644
index 0000000000000000000000000000000000000000..7a9be0a8cc6e9123a0beb597d4be2683aa7546ff
--- /dev/null
+++ b/test/cases/compile_errors/async/wrong_type_for_argument_tuple_to_asyncCall.zig
@@ -0,0 +1,14 @@
+export fn entry1() void {
+    var frame: @Frame(foo) = undefined;
+    @asyncCall(&frame, {}, foo, {});
+}
+
+fn foo() i32 {
+    return 0;
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:3:33: error: expected tuple or struct, found 'void'
diff --git a/test/cases/compile_errors/async/wrong_type_for_result_ptr_to_asyncCall.zig b/test/cases/compile_errors/async/wrong_type_for_result_ptr_to_asyncCall.zig
new file mode 100644
index 0000000000000000000000000000000000000000..b4193d4de11d50385900de8afa2b18c4ee2d3f74
--- /dev/null
+++ b/test/cases/compile_errors/async/wrong_type_for_result_ptr_to_asyncCall.zig
@@ -0,0 +1,16 @@
+export fn entry() void {
+    _ = async amain();
+}
+fn amain() i32 {
+    var frame: @Frame(foo) = undefined;
+    return await @asyncCall(&frame, false, foo, .{});
+}
+fn foo() i32 {
+    return 1234;
+}
+
+// error
+// backend=stage1
+// target=native
+//
+// tmp.zig:6:37: error: expected type '*i32', found 'bool'
diff --git a/test/cases/compile_errors/stage1/obj/Frame_of_generic_function.zig b/test/cases/compile_errors/stage1/obj/Frame_of_generic_function.zig
deleted file mode 100644
index d90e53eb4683dba5f55a8e99388d04f47aa91390..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/Frame_of_generic_function.zig
+++ /dev/null
@@ -1,14 +0,0 @@
-export fn entry() void {
-    var frame: @Frame(func) = undefined;
-    _ = frame;
-}
-fn func(comptime T: type) void {
-    var x: T = undefined;
-    _ = x;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:2:16: error: @Frame() of generic function
diff --git a/test/cases/compile_errors/stage1/obj/async_function_depends_on_its_own_frame.zig b/test/cases/compile_errors/stage1/obj/async_function_depends_on_its_own_frame.zig
deleted file mode 100644
index 4dde5860bafc4709d376e1703df95b14ce58420f..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/async_function_depends_on_its_own_frame.zig
+++ /dev/null
@@ -1,13 +0,0 @@
-export fn entry() void {
-    _ = async amain();
-}
-fn amain() callconv(.Async) void {
-    var x: [@sizeOf(@Frame(amain))]u8 = undefined;
-    _ = x;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:4:1: error: cannot resolve '@Frame(amain)': function not fully analyzed yet
diff --git a/test/cases/compile_errors/stage1/obj/async_function_indirectly_depends_on_its_own_frame.zig b/test/cases/compile_errors/stage1/obj/async_function_indirectly_depends_on_its_own_frame.zig
deleted file mode 100644
index 4dac0d4fa33fbc45db20184af0c0734552b9df81..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/async_function_indirectly_depends_on_its_own_frame.zig
+++ /dev/null
@@ -1,17 +0,0 @@
-export fn entry() void {
-    _ = async amain();
-}
-fn amain() callconv(.Async) void {
-    other();
-}
-fn other() void {
-    var x: [@sizeOf(@Frame(amain))]u8 = undefined;
-    _ = x;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:4:1: error: unable to determine async function frame of 'amain'
-// tmp.zig:5:10: note: analysis of function 'other' depends on the frame
diff --git a/test/cases/compile_errors/stage1/obj/bad_alignment_in_asynccall.zig b/test/cases/compile_errors/stage1/obj/bad_alignment_in_asynccall.zig
deleted file mode 100644
index 399914000994b76b44c91e8200b74dafcd7aa1be..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/bad_alignment_in_asynccall.zig
+++ /dev/null
@@ -1,12 +0,0 @@
-export fn entry() void {
-    var ptr: fn () callconv(.Async) void = func;
-    var bytes: [64]u8 = undefined;
-    _ = @asyncCall(&bytes, {}, ptr, .{});
-}
-fn func() callconv(.Async) void {}
-
-// error
-// backend=stage1
-// target=aarch64-linux-none
-//
-// tmp.zig:4:21: error: expected type '[]align(8) u8', found '*[64]u8'
diff --git a/test/cases/compile_errors/stage1/obj/const_frame_cast_to_anyframe.zig b/test/cases/compile_errors/stage1/obj/const_frame_cast_to_anyframe.zig
deleted file mode 100644
index affdb953d72f317ea094a806b6c08aa05c135256..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/const_frame_cast_to_anyframe.zig
+++ /dev/null
@@ -1,19 +0,0 @@
-export fn a() void {
-    const f = async func();
-    resume f;
-}
-export fn b() void {
-    const f = async func();
-    var x: anyframe = &f;
-    _ = x;
-}
-fn func() void {
-    suspend {}
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:12: error: expected type 'anyframe', found '*const @Frame(func)'
-// tmp.zig:7:24: error: expected type 'anyframe', found '*const @Frame(func)'
diff --git a/test/cases/compile_errors/stage1/obj/exported_async_function.zig b/test/cases/compile_errors/stage1/obj/exported_async_function.zig
deleted file mode 100644
index b9ac591227d95ea9cf01595a357c97d4e00950fb..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/exported_async_function.zig
+++ /dev/null
@@ -1,7 +0,0 @@
-export fn foo() callconv(.Async) void {}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:1:1: error: exported function cannot be async
diff --git a/test/cases/compile_errors/stage1/obj/frame_called_outside_of_function_definition.zig b/test/cases/compile_errors/stage1/obj/frame_called_outside_of_function_definition.zig
deleted file mode 100644
index d14099815287f35321510c87104e0a5831a970a6..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/frame_called_outside_of_function_definition.zig
+++ /dev/null
@@ -1,11 +0,0 @@
-var handle_undef: anyframe = undefined;
-var handle_dummy: anyframe = @frame();
-export fn entry() bool {
-    return handle_undef == handle_dummy;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:2:30: error: @frame() called outside of function definition
diff --git a/test/cases/compile_errors/stage1/obj/frame_causes_function_to_be_async.zig b/test/cases/compile_errors/stage1/obj/frame_causes_function_to_be_async.zig
deleted file mode 100644
index f8493b08b2c9e3374ee9c5c8297601c397964dea..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/frame_causes_function_to_be_async.zig
+++ /dev/null
@@ -1,13 +0,0 @@
-export fn entry() void {
-    func();
-}
-fn func() void {
-    _ = @frame();
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:1:1: error: function with calling convention 'C' cannot be async
-// tmp.zig:5:9: note: @frame() causes function to be async
diff --git a/test/cases/compile_errors/stage1/obj/function_with_ccc_indirectly_calling_async_function.zig b/test/cases/compile_errors/stage1/obj/function_with_ccc_indirectly_calling_async_function.zig
deleted file mode 100644
index 9fadb992b4c68407ab3c65c208d968b29123bf7a..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/function_with_ccc_indirectly_calling_async_function.zig
+++ /dev/null
@@ -1,18 +0,0 @@
-export fn entry() void {
-    foo();
-}
-fn foo() void {
-    bar();
-}
-fn bar() void {
-    suspend {}
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:1:1: error: function with calling convention 'C' cannot be async
-// tmp.zig:2:8: note: async function call here
-// tmp.zig:5:8: note: async function call here
-// tmp.zig:8:5: note: suspends here
diff --git a/test/cases/compile_errors/stage1/obj/indirect_recursion_of_async_functions_detected.zig b/test/cases/compile_errors/stage1/obj/indirect_recursion_of_async_functions_detected.zig
deleted file mode 100644
index d845dc7930a73e4c85f24b57f9c6432a64bae4d3..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/indirect_recursion_of_async_functions_detected.zig
+++ /dev/null
@@ -1,36 +0,0 @@
-var frame: ?anyframe = null;
-
-export fn a() void {
-    _ = async rangeSum(10);
-    while (frame) |f| resume f;
-}
-
-fn rangeSum(x: i32) i32 {
-    suspend {
-        frame = @frame();
-    }
-    frame = null;
-
-    if (x == 0) return 0;
-    var child = rangeSumIndirect(x - 1);
-    return child + 1;
-}
-
-fn rangeSumIndirect(x: i32) i32 {
-    suspend {
-        frame = @frame();
-    }
-    frame = null;
-
-    if (x == 0) return 0;
-    var child = rangeSum(x - 1);
-    return child + 1;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:8:1: error: '@Frame(rangeSum)' depends on itself
-// tmp.zig:15:33: note: when analyzing type '@Frame(rangeSum)' here
-// tmp.zig:26:25: note: when analyzing type '@Frame(rangeSumIndirect)' here
diff --git a/test/cases/compile_errors/stage1/obj/invalid_suspend_in_exported_function.zig b/test/cases/compile_errors/stage1/obj/invalid_suspend_in_exported_function.zig
deleted file mode 100644
index cfcbfba889dfd57b1260ee14df08d354f4973de4..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/invalid_suspend_in_exported_function.zig
+++ /dev/null
@@ -1,15 +0,0 @@
-export fn entry() void {
-    var frame = async func();
-    var result = await frame;
-    _ = result;
-}
-fn func() void {
-    suspend {}
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:1:1: error: function with calling convention 'C' cannot be async
-// tmp.zig:3:18: note: await here is a suspend point
diff --git a/test/cases/compile_errors/stage1/obj/non-async_function_pointer_eventually_is_inferred_to_become_async.zig b/test/cases/compile_errors/stage1/obj/non-async_function_pointer_eventually_is_inferred_to_become_async.zig
deleted file mode 100644
index e18b4200289d80343d38cee2da9101f81916c0f5..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/non-async_function_pointer_eventually_is_inferred_to_become_async.zig
+++ /dev/null
@@ -1,15 +0,0 @@
-export fn a() void {
-    var non_async_fn: fn () void = undefined;
-    non_async_fn = func;
-}
-fn func() void {
-    suspend {}
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:5:1: error: 'func' cannot be async
-// tmp.zig:3:20: note: required to be non-async here
-// tmp.zig:6:5: note: suspends here
diff --git a/test/cases/compile_errors/stage1/obj/non_async_function_pointer_passed_to_asyncCall.zig b/test/cases/compile_errors/stage1/obj/non_async_function_pointer_passed_to_asyncCall.zig
deleted file mode 100644
index d8ab4087e0a32dd2971c7bc51e3b662d30281bb0..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/non_async_function_pointer_passed_to_asyncCall.zig
+++ /dev/null
@@ -1,12 +0,0 @@
-export fn entry() void {
-    var ptr = afunc;
-    var bytes: [100]u8 align(16) = undefined;
-    _ = @asyncCall(&bytes, {}, ptr, .{});
-}
-fn afunc() void { }
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:4:32: error: expected async function, found 'fn() void'
diff --git a/test/cases/compile_errors/stage1/obj/prevent_bad_implicit_casting_of_anyframe_types.zig b/test/cases/compile_errors/stage1/obj/prevent_bad_implicit_casting_of_anyframe_types.zig
deleted file mode 100644
index 066bf1c1078762194d4d509fdf795a6362af8eff..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/prevent_bad_implicit_casting_of_anyframe_types.zig
+++ /dev/null
@@ -1,24 +0,0 @@
-export fn a() void {
-    var x: anyframe = undefined;
-    var y: anyframe->i32 = x;
-    _ = y;
-}
-export fn b() void {
-    var x: i32 = undefined;
-    var y: anyframe->i32 = x;
-    _ = y;
-}
-export fn c() void {
-    var x: @Frame(func) = undefined;
-    var y: anyframe->i32 = &x;
-    _ = y;
-}
-fn func() void {}
-
-// error
-// backend=stage1
-// target=native
-//
-// :3:28: error: expected type 'anyframe->i32', found 'anyframe'
-// :8:28: error: expected type 'anyframe->i32', found 'i32'
-// tmp.zig:13:29: error: expected type 'anyframe->i32', found '*@Frame(func)'
\ No newline at end of file
diff --git a/test/cases/compile_errors/stage1/obj/returning_error_from_void_async_function.zig b/test/cases/compile_errors/stage1/obj/returning_error_from_void_async_function.zig
deleted file mode 100644
index 691c89a3478e21324685d27680ec26c13b0fc5f2..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/returning_error_from_void_async_function.zig
+++ /dev/null
@@ -1,12 +0,0 @@
-export fn entry() void {
-    _ = async amain();
-}
-fn amain() callconv(.Async) void {
-    return error.ShouldBeCompileError;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:5:17: error: expected type 'void', found 'error{ShouldBeCompileError}'
diff --git a/test/cases/compile_errors/stage1/obj/runtime-known_async_function_called.zig b/test/cases/compile_errors/stage1/obj/runtime-known_async_function_called.zig
deleted file mode 100644
index 90685ce566297391b6924ec1a56cddc2db28aa9a..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/runtime-known_async_function_called.zig
+++ /dev/null
@@ -1,14 +0,0 @@
-export fn entry() void {
-    _ = async amain();
-}
-fn amain() void {
-    var ptr = afunc;
-    _ = ptr();
-}
-fn afunc() callconv(.Async) void {}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:6:12: error: function is not comptime-known; @asyncCall required
diff --git a/test/cases/compile_errors/stage1/obj/runtime-known_function_called_with_async_keyword.zig b/test/cases/compile_errors/stage1/obj/runtime-known_function_called_with_async_keyword.zig
deleted file mode 100644
index c66d0f9cbb557517b1e02bfd271871d2b229243e..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/runtime-known_function_called_with_async_keyword.zig
+++ /dev/null
@@ -1,12 +0,0 @@
-export fn entry() void {
-    var ptr = afunc;
-    _ = async ptr();
-}
-
-fn afunc() callconv(.Async) void { }
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:15: error: function is not comptime-known; @asyncCall required
diff --git a/test/cases/compile_errors/stage1/obj/wrong_frame_type_used_for_async_call.zig b/test/cases/compile_errors/stage1/obj/wrong_frame_type_used_for_async_call.zig
deleted file mode 100644
index c02c20f495d8760272493a144f2054264cf474f6..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/wrong_frame_type_used_for_async_call.zig
+++ /dev/null
@@ -1,16 +0,0 @@
-export fn entry() void {
-    var frame: @Frame(foo) = undefined;
-    frame = async bar();
-}
-fn foo() void {
-    suspend {}
-}
-fn bar() void {
-    suspend {}
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:13: error: expected type '*@Frame(bar)', found '*@Frame(foo)'
diff --git a/test/cases/compile_errors/stage1/obj/wrong_type_for_argument_tuple_to_asyncCall.zig b/test/cases/compile_errors/stage1/obj/wrong_type_for_argument_tuple_to_asyncCall.zig
deleted file mode 100644
index 7a9be0a8cc6e9123a0beb597d4be2683aa7546ff..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/wrong_type_for_argument_tuple_to_asyncCall.zig
+++ /dev/null
@@ -1,14 +0,0 @@
-export fn entry1() void {
-    var frame: @Frame(foo) = undefined;
-    @asyncCall(&frame, {}, foo, {});
-}
-
-fn foo() i32 {
-    return 0;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:3:33: error: expected tuple or struct, found 'void'
diff --git a/test/cases/compile_errors/stage1/obj/wrong_type_for_result_ptr_to_asyncCall.zig b/test/cases/compile_errors/stage1/obj/wrong_type_for_result_ptr_to_asyncCall.zig
deleted file mode 100644
index b4193d4de11d50385900de8afa2b18c4ee2d3f74..0000000000000000000000000000000000000000
--- a/test/cases/compile_errors/stage1/obj/wrong_type_for_result_ptr_to_asyncCall.zig
+++ /dev/null
@@ -1,16 +0,0 @@
-export fn entry() void {
-    _ = async amain();
-}
-fn amain() i32 {
-    var frame: @Frame(foo) = undefined;
-    return await @asyncCall(&frame, false, foo, .{});
-}
-fn foo() i32 {
-    return 1234;
-}
-
-// error
-// backend=stage1
-// target=native
-//
-// tmp.zig:6:37: error: expected type '*i32', found 'bool'