CODEWITHSUNDEEP
modulerust
Moebius
Moebius

Reputation: 6528

"unresolved import" with a circular dependency between modules

I have two files :

As you can see there is a circular dependency between these two modules. It seems like sometimes Rust supports circular dependencies, but for this case, the compiler throws errors:

src/json/mod.rs:1:25: 1:31 error: unresolved import (maybe you meant `ToJson::*`?)
src/json/mod.rs:1 pub use self::to_json::{ToJson};
                                          ^~~~~~
src/json/builder.rs:2:18: 2:22 error: unresolved import (maybe you meant `Json::*`?)
src/json/builder.rs:2 use json::json::{Json, JsonEvent, Array, Object}; //commenting this line solve the dependency error

[...]

The code is here in the branch json_mod. I tried to reproduce the problem in fewer lines of code, but the circular dependencies I created compiled correctly.

After the debugging, something like 400 errors are left — this is normal as I am in the process of a huge code refactoring (splitting one file of ~= 4000 line file into many files) and I still have a lot of work to do before making it work.

Upvotes: 5

Views: 4507

Answers (1)

bluss
bluss

Reputation: 13792

Edit: Glorious news, the bug mentioned below is fixed! It's fixed in Rust 1.4 or later.

Glob imports (use foo::*) have a known bug where they are incompatible with cyclic imports. I would try removing the glob imports in both affected modules.

Upvotes: 5

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