Sema: copy fn param ty in `zirTypeInfo`

Closes #12247

1 files changed, 17 insertions, 0 deletions

diff --git a/test/cases/fn_typeinfo_passed_to_comptime_fn.zig b/test/cases/fn_typeinfo_passed_to_comptime_fn.zig
new file mode 100644
index 0000000000..29f1d0c67b
--- /dev/null
+++ b/test/cases/fn_typeinfo_passed_to_comptime_fn.zig
@@ -0,0 +1,17 @@
+const std = @import("std");
+
+test {
+    try foo(@typeInfo(@TypeOf(someFn)));
+}
+
+fn someFn(arg: ?*c_int) f64 {
+    _ = arg;
+    return 8;
+}
+fn foo(comptime info: std.builtin.Type) !void {
+    try std.testing.expect(info.Fn.args[0].arg_type.? == ?*c_int);
+}
+
+// run
+// is_test=1
+//