Rollup merge of #58273 - taiki-e:rename-dependency, r=matthewjasper

Rename rustc_errors dependency in rust 2018 crates

I think this is a better solution than `use rustc_errors as errors` in `lib.rs` and `use crate::errors` in modules.

Related: rust-lang/cargo#5653

cc #58099

r? @Centril

src/libsyntax_ext/Cargo.toml

@@ -11,7 +11,7 @@ crate-type = ["dylib"]
 
 [dependencies]
 fmt_macros = { path = "../libfmt_macros" }
-rustc_errors = { path = "../librustc_errors" }
+errors = { path = "../librustc_errors", package = "rustc_errors" }
 syntax = { path = "../libsyntax" }
 syntax_pos = { path = "../libsyntax_pos" }
 rustc_data_structures = { path = "../librustc_data_structures" }

src/libsyntax_ext/asm.rs

@@ -4,7 +4,7 @@
 
 use rustc_data_structures::thin_vec::ThinVec;
 
-use crate::errors::DiagnosticBuilder;
+use errors::DiagnosticBuilder;
 
 use syntax::ast;
 use syntax::ext::base::{self, *};

src/libsyntax_ext/assert.rs

@@ -1,4 +1,4 @@
-use crate::errors::DiagnosticBuilder;
+use errors::DiagnosticBuilder;
 
 use syntax::ast::{self, *};
 use syntax::source_map::Spanned;

src/libsyntax_ext/cfg.rs

@@ -2,7 +2,7 @@
 /// a literal `true` or `false` based on whether the given cfg matches the
 /// current compilation environment.
 
-use crate::errors::DiagnosticBuilder;
+use errors::DiagnosticBuilder;
 
 use syntax::ast;
 use syntax::ext::base::{self, *};

src/libsyntax_ext/deriving/custom.rs

@@ -1,7 +1,7 @@
-use crate::errors::FatalError;
 use crate::proc_macro_impl::EXEC_STRATEGY;
 use crate::proc_macro_server;
 
+use errors::FatalError;
 use syntax::ast::{self, ItemKind, Attribute, Mac};
 use syntax::attr::{mark_used, mark_known};
 use syntax::source_map::Span;

src/libsyntax_ext/format.rs

@@ -3,8 +3,8 @@
 
 use fmt_macros as parse;
 
-use crate::errors::DiagnosticBuilder;
-use crate::errors::Applicability;
+use errors::DiagnosticBuilder;
+use errors::Applicability;
 
 use syntax::ast;
 use syntax::ext::base::{self, *};

src/libsyntax_ext/global_asm.rs

@@ -8,7 +8,7 @@
 /// LLVM's `module asm "some assembly here"`. All of LLVM's caveats
 /// therefore apply.
 
-use crate::errors::DiagnosticBuilder;
+use errors::DiagnosticBuilder;
 
 use syntax::ast;
 use syntax::source_map::respan;

src/libsyntax_ext/lib.rs

@@ -16,8 +16,6 @@
 
 extern crate proc_macro;
 
-use rustc_errors as errors;
-
 mod diagnostics;
 
 mod asm;

src/libsyntax_ext/proc_macro_decls.rs

@@ -1,7 +1,6 @@
 use std::mem;
 
 use crate::deriving;
-use crate::errors;
 
 use syntax::ast::{self, Ident};
 use syntax::attr;

src/libsyntax_ext/proc_macro_impl.rs

@@ -1,6 +1,6 @@
-use crate::errors::FatalError;
 use crate::proc_macro_server;
 
+use errors::FatalError;
 use syntax::source_map::Span;
 use syntax::ext::base::{self, *};
 use syntax::tokenstream::TokenStream;

src/libsyntax_ext/proc_macro_server.rs

@@ -1,4 +1,4 @@
-use crate::errors::{self, Diagnostic, DiagnosticBuilder};
+use errors::{Diagnostic, DiagnosticBuilder};
 
 use std::panic;