duplicate definition of module core with bad span

[brson]

A crate that uses the core library gets a mysterious error message with a dummy span.

#[link(name = "rustmeta",                                                                                                                                                     
       vers = "0.2",                                                                                                                                                          
       uuid = "f19085c3-dd45-467d-b76b-cb07e5ecd13c")];                                                                                                                       

#[crate_type = "lib"];                                                                                                                                                        

use core(vers = "0.2");                                                                                                                                                       
use std(vers = "0.2");                                                                                                                                                        
use rustsyntax(vers = "0.2");                                                                                                                                                 

import core::*;                                                                                                                                                               
import syntax = rustsyntax;

../src/librustmeta/rustmeta.rc:1:0: 1:0 error: duplicate definition of module core
../src/librustmeta/rustmeta.rc:1 #[link(name = "rustmeta",

We know this happened because of the injected core library, so we should say so.

[marijnh]

Or even simply not auto-inject core when it is already explicitly used. Some people just like to be explicit.

[bstrie]

Compiling this updated example:

#[link(name = "rustmeta",
       vers = "0.2",
       uuid = "f19085c3-dd45-467d-b76b-cb07e5ecd13c")];

#[crate_type = "lib"];

extern mod core;

use core::*;

compiles with:

$ rustc co.rs
co.rs:9:4: 9:12 warning: unused import
co.rs:9 use core::*;
            ^~~~~~~~

and correctly produces librustmeta-279555307fd8ef-0.2.so.