Rollup merge of #34403 - jonathandturner:move_liberror, r=alexcrichton

This PR refactors the 'errors' part of libsyntax into its own crate (librustc_errors).  This is the first part of a few refactorings to simplify error reporting and potentially support more output formats (like a standardized JSON output and possibly an --explain mode that can work with the user's code), though this PR stands on its own and doesn't assume further changes.

As part of separating out the errors crate, I have also refactored the code position portion of codemap into its own crate (libsyntax_pos).  While it's helpful to have the common code positions in a separate crate for the new errors crate, this may also enable further simplifications in the future.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/libsyntax/diagnostics/plugin.rs b/src/libsyntax/diagnostics/plugin.rs
index 26088b1242e..abf2b39d5c6 100644
--- a/src/libsyntax/diagnostics/plugin.rs
+++ b/src/libsyntax/diagnostics/plugin.rs
@@ -14,7 +14,7 @@ use std::env;
 
 use ast;
 use ast::{Ident, Name, TokenTree};
-use codemap::Span;
+use syntax_pos::Span;
 use ext::base::{ExtCtxt, MacEager, MacResult};
 use ext::build::AstBuilder;
 use parse::token;
@@ -23,6 +23,8 @@ use util::small_vector::SmallVector;
 
 use diagnostics::metadata::output_metadata;
 
+pub use errors::*;
+
 // Maximum width of any line in an extended error description (inclusive).
 const MAX_DESCRIPTION_WIDTH: usize = 80;