error: duplicate entry for ... [E0152] doesn't specify a source

[Zoxc]

E0152 doesn't specify the source/location of the error. This is the output of rustc when cargo pulls in multiple libcores:

error: duplicate entry for `const_ptr` [E0152]
error: duplicate entry for `mut_ptr` [E0152]
error: duplicate entry for `i8` [E0152]
error: duplicate entry for `i16` [E0152]
error: duplicate entry for `i32` [E0152]
error: duplicate entry for `i64` [E0152]
error: duplicate entry for `isize` [E0152]
error: duplicate entry for `u8` [E0152]
error: duplicate entry for `u16` [E0152]
error: duplicate entry for `u32` [E0152]
error: duplicate entry for `u64` [E0152]
error: duplicate entry for `usize` [E0152]
error: duplicate entry for `send` [E0152]
error: duplicate entry for `sized` [E0152]
error: duplicate entry for `unsize` [E0152]
error: duplicate entry for `copy` [E0152]
error: duplicate entry for `sync` [E0152]
error: duplicate entry for `drop` [E0152]
error: duplicate entry for `coerce_unsized` [E0152]
error: duplicate entry for `add` [E0152]
error: duplicate entry for `sub` [E0152]
error: duplicate entry for `mul` [E0152]
error: duplicate entry for `div` [E0152]
error: duplicate entry for `rem` [E0152]
error: duplicate entry for `neg` [E0152]
error: duplicate entry for `not` [E0152]
error: duplicate entry for `bitxor` [E0152]
error: duplicate entry for `bitand` [E0152]
error: duplicate entry for `bitor` [E0152]
error: duplicate entry for `shl` [E0152]
error: duplicate entry for `shr` [E0152]
error: duplicate entry for `add_assign` [E0152]
error: duplicate entry for `sub_assign` [E0152]
error: duplicate entry for `mul_assign` [E0152]
error: duplicate entry for `div_assign` [E0152]
error: duplicate entry for `rem_assign` [E0152]
error: duplicate entry for `bitxor_assign` [E0152]
error: duplicate entry for `bitand_assign` [E0152]
error: duplicate entry for `bitor_assign` [E0152]
error: duplicate entry for `shl_assign` [E0152]
error: duplicate entry for `shr_assign` [E0152]
error: duplicate entry for `index` [E0152]
error: duplicate entry for `index_mut` [E0152]
error: duplicate entry for `range` [E0152]
error: duplicate entry for `range_from` [E0152]
error: duplicate entry for `range_to` [E0152]
error: duplicate entry for `range_full` [E0152]
error: duplicate entry for `unsafe_cell` [E0152]
error: duplicate entry for `deref` [E0152]
error: duplicate entry for `deref_mut` [E0152]
error: duplicate entry for `fn` [E0152]
error: duplicate entry for `fn_mut` [E0152]
error: duplicate entry for `fn_once` [E0152]
error: duplicate entry for `eq` [E0152]
error: duplicate entry for `ord` [E0152]
error: duplicate entry for `str_eq` [E0152]
error: duplicate entry for `panic` [E0152]
error: duplicate entry for `panic_bounds_check` [E0152]
error: duplicate entry for `phantom_data` [E0152]
error: duplicate entry for `non_zero` [E0152]
error: duplicate entry for `debug_trait` [E0152]
error: aborting due to 61 previous errors
Could not compile `std`.

[GuillaumeGomez]

Strange error. The code which spans it is here where it checks all objects definition. It is possible to also add from where this definition comes from. I'm taking a look.

[Zoxc]

@GuillaumeGomez I'd require error to give me the source location of 2 definitions before considering this fixed (or if that is not possible, the full path to the item implementing the language item in the external crate)

[GuillaumeGomez]

Hum... I'll try to add as much information as possible.

[GuillaumeGomez]

It needs to be reopened. My PR didn't fix it.

[Mark-Simulacrum]

This has been fixed.

Current error and code:

#![feature(lang_items)]

#[lang = "panic_fmt"]
fn panic_fmt() -> ! {
    loop {}
}

fn main() {}

error[E0152]: duplicate lang item found: `panic_fmt`.
 --> src/lib.rs:4:1
  |
4 | / fn panic_fmt() -> ! {
5 | |     loop {}
6 | | }
  | |_^
  |
  = note: first defined in crate `std`.

error: aborting due to previous error