LiftContext::convert struggles with linked multi-stage SPIRV

[incertia]

The two test shaders are identical.

#version 460
void main(){}

$ glslc test.vert -o vert.spv
$ glslc test.frag -o frag.spv
$ spirv-link vert.spv frag.spv -o test.spv
$ cargo run rspirv-test vert.spv frag.spv test.spv
vert.spv: success
frag.spv: success
thread 'main' panicked at 'Id 1 is already used', /home/incertia/.cargo/registry/src/github.com-1ecc6299db9ec823/rspirv-0.7.0/lift/storage.rs:42:35
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

We have a simple test driver that attempts to convert modules.

use rspirv::dr::*;
use rspirv::lift::*;
use std::env;
use std::fs::read;

fn main() {
  for file in env::args().skip(1) {
    match read(&file) {
      Ok(spv) => match load_bytes(spv) {
        Ok(module) => match LiftContext::convert(&module) {
          Ok(module) => {
            println!("{}: success", file);
          }
          Err(e) => {
            println!("{}: {:?}", file, e);
          }
        },
        Err(e) => {
          println!("{}: {}", file, e);
        }
      },
      Err(e) => {
        println!("{}: {}", file, e);
      }
    }
  }
}

spirv-dis does not report anything out of the ordinary.

$ spirv-dis test.spv
; SPIR-V
; Version: 1.0
; Generator: Khronos; 17
; Bound: 8
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Vertex %main "main"
               OpEntryPoint Fragment %main_0 "main"
               OpExecutionMode %main_0 OriginUpperLeft
               OpSource GLSL 460
               OpSourceExtension "GL_GOOGLE_cpp_style_line_directive"
               OpSourceExtension "GL_GOOGLE_include_directive"
               OpSource GLSL 460
               OpSourceExtension "GL_GOOGLE_cpp_style_line_directive"
               OpSourceExtension "GL_GOOGLE_include_directive"
               OpName %main "main"
               OpName %main_0 "main"
       %void = OpTypeVoid
          %5 = OpTypeFunction %void
       %main = OpFunction %void None %5
          %6 = OpLabel
               OpReturn
               OpFunctionEnd
     %main_0 = OpFunction %void None %5
          %7 = OpLabel
               OpReturn
               OpFunctionEnd

I'm not quite sure why we are attempting to create ID 1 twice.