`#pragma pack(1)` struct containing another packed struct is not packed itself.

Input C/C++ Header

#include <stdint.h>

#pragma pack(1)

typedef struct {
  uint64_t value;
} first_t;

typedef struct {
  first_t value;
} second_t;

#pragma pack()

Bindgen Invocation

$ bindgen input.h

Actual Results

#[repr(C, packed)]
#[derive(Debug, Copy, Clone)]
pub struct first_t {
    pub value: u64,
}

#[repr(C)]
#[derive(Debug, Copy, Clone)]
pub struct second_t {
    pub value: first_t,
}

Expected Results

The second_t struct should be #[repr(C, packed)], not just #[repr(C)].

#[repr(C, packed)]
#[derive(Debug, Copy, Clone)]
pub struct first_t {
    pub value: u64,
}

#[repr(C, packed)]
#[derive(Debug, Copy, Clone)]
pub struct second_t {
    pub value: first_t,
}

Start by reproducing the issue with the input.h header and the bindgen input.h command, then trace the struct-layout or attribute-generation path that emits repr attributes. Done means the generated second_t includes #[repr(C, packed)] while preserving the existing output for first_t.