rename_types does not appear to work

[fw-immunant]

This may well be an issue of my understanding, but I've read the documentation and would expect this to result in a memory_map struct rather than MemoryMap:

cbindgen.toml:

language = "C"

[export]
item_types = ["structs", "opaque", "functions"]

[export.mangle]
rename_types = "snake_case"

lib.rs:

#[repr(C)]
pub struct MemoryMap {
    x: u32,
}

#[no_mangle]
pub extern "C" fn memory_map_new() -> Box<MemoryMap> {
    Box::new(MemoryMap {})
}

Cargo.toml:

[package]
name = "cbindgen-test"
version = "0.1.0"
edition = "2021"

Output:

#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>

typedef struct MemoryMap {
  uint32_t x;
} MemoryMap;

struct MemoryMap *memory_map_new(void);

Am I misunderstanding which types rename_types is supposed to apply to? I know this can be worked around with the export.rename feature, but this seems to be what rename_types should do in general, rather than having to write out each renaming one by one.

[ericdrobinson]

Possibly related: #763.