{"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"//"}]}
                // define void @_foo(ptr <..> sret([32 x i8]) initializes((0, 32)) %0, <...>) {
                // This is what we already have in our outer_fn (shortened):
                //   %7 = call [4 x double] (...) @__enzyme_fwddiff_foo(ptr @square, metadata !"enzyme_width", i64 4, <...>)