Why can't I import module from different file in same directory? [duplicate]

Question

My directory structure:

src
    main.rs
    image.rs
    decoders.rs

When I try to import my decoders module in image.rs I get this:

error[E0583]: File not found for module `decoders`

decoders.rs:

pub mod Decoders {}

image.rs:

mod decoders

use decoders::Decoders

pub mod Image {}

Note: I am using a module that wraps the entire file on purpose that's I can put attributes on entire files. This is why it's not a duplicate of How to include module from another file from the same project?

The weird thing is, is that this syntax works perfectly fine when I try to import Image in main.rs:

mod image;

use image::Image;

Answer 1

What's happening is that when you try to import decoders::Decoders in image.rs, you need to go through the next level up, because using this:

mod decoders

use decoders::Decoders

Means that decoders will now be "owned" or under image, which means that the compiler will search in the image subdirectory for decoders.rs. So, to fix this, you can either change your file structure to this:

src/
    main.rs
    image.rs        ** or image/mod.rs
    image/
        decoder.rs

Or, use this in main.rs:

mod decoders;
mod image;

and this in image.rs:

use super::decoders::Decoders;
//Or alternatively
use crate::decoders::Decoders;

Also, to fix your nested-mod problem, do the following in decoders.rs:

//Your code, no `mod Decoders`

and the following where you have your mod decoders statement:

#[your_attribs]
mod decoders;