From 1c0a5469edcb11bdbfd44a1eb227aacd95aff0ca Mon Sep 17 00:00:00 2001
From: Matthew Jasper <mjjasper1@gmail.com>
Date: Tue, 13 Aug 2019 19:19:31 +0100
Subject: [PATCH] Remove unused `SyntaxContext` serialization impls

The implementations were wrong and unused.
---
 src/librustc_metadata/decoder.rs | 8 --------
 src/librustc_metadata/encoder.rs | 8 --------
 src/libsyntax_pos/hygiene.rs     | 4 ----
 3 files changed, 20 deletions(-)

diff --git a/src/librustc_metadata/decoder.rs b/src/librustc_metadata/decoder.rs
index 4365b1bee583f..772b2d3ec4d85 100644
--- a/src/librustc_metadata/decoder.rs
+++ b/src/librustc_metadata/decoder.rs
@@ -356,14 +356,6 @@ impl SpecializedDecoder<Ident> for DecodeContext<'_, '_> {
     }
 }
 
-impl SpecializedDecoder<SyntaxContext> for DecodeContext<'_, '_> {
-    fn specialized_decode(&mut self) -> Result<SyntaxContext, Self::Error> {
-        // FIXME(jseyfried): intercrate hygiene
-
-        Ok(SyntaxContext::empty())
-    }
-}
-
 impl<'a, 'tcx> SpecializedDecoder<Fingerprint> for DecodeContext<'a, 'tcx> {
     fn specialized_decode(&mut self) -> Result<Fingerprint, Self::Error> {
         Fingerprint::decode_opaque(&mut self.opaque)
diff --git a/src/librustc_metadata/encoder.rs b/src/librustc_metadata/encoder.rs
index 34ccdad8636c9..e2de0552cd651 100644
--- a/src/librustc_metadata/encoder.rs
+++ b/src/librustc_metadata/encoder.rs
@@ -33,7 +33,6 @@ use syntax::attr;
 use syntax::source_map::Spanned;
 use syntax::symbol::{kw, sym, Ident};
 use syntax_pos::{self, FileName, SourceFile, Span};
-use syntax_pos::hygiene::SyntaxContext;
 use log::{debug, trace};
 
 use rustc::hir::{self, PatKind};
@@ -181,13 +180,6 @@ impl SpecializedEncoder<Ident> for EncodeContext<'tcx> {
     }
 }
 
-impl SpecializedEncoder<SyntaxContext> for EncodeContext<'tcx> {
-    fn specialized_encode(&mut self, _ctxt: &SyntaxContext) -> Result<(), Self::Error> {
-        // FIXME(jseyfried): intercrate hygiene
-        Ok(())
-    }
-}
-
 impl<'tcx> SpecializedEncoder<LocalDefId> for EncodeContext<'tcx> {
     #[inline]
     fn specialized_encode(&mut self, def_id: &LocalDefId) -> Result<(), Self::Error> {
diff --git a/src/libsyntax_pos/hygiene.rs b/src/libsyntax_pos/hygiene.rs
index 1e40994e77bf1..ebfb0764fa2b2 100644
--- a/src/libsyntax_pos/hygiene.rs
+++ b/src/libsyntax_pos/hygiene.rs
@@ -750,7 +750,3 @@ impl Decodable for ExpnId {
         Ok(ExpnId::root()) // FIXME(jseyfried) intercrate hygiene
     }
 }
-
-impl UseSpecializedEncodable for SyntaxContext {}
-
-impl UseSpecializedDecodable for SyntaxContext {}