Remove serialization of diagnostics to files

This is no longer used by the index generator and was always an unstable
compiler detail, so strip it out.

This also leaves in RUSTC_ERROR_METADATA_DST since the stage0 compiler
still needs it to be set.

2 files changed, 2 insertions, 4 deletions

diff --git a/src/bootstrap/doc.rs b/src/bootstrap/doc.rs
index 36229720e42..4f96c12fc1d 100644
--- a/src/bootstrap/doc.rs
+++ b/src/bootstrap/doc.rs
@@ -825,8 +825,7 @@ impl Step for ErrorIndex {
         index.arg(crate::channel::CFG_RELEASE_NUM);
 
         // FIXME: shouldn't have to pass this env var
-        index.env("CFG_BUILD", &builder.config.build)
-             .env("RUSTC_ERROR_METADATA_DST", builder.extended_error_dir());
+        index.env("CFG_BUILD", &builder.config.build);
 
         builder.run(&mut index);
     }
diff --git a/src/bootstrap/test.rs b/src/bootstrap/test.rs
index c2c134bfd1d..87bd5cbacff 100644
--- a/src/bootstrap/test.rs
+++ b/src/bootstrap/test.rs
@@ -1535,8 +1535,7 @@ impl Step for ErrorIndex {
         );
         tool.arg("markdown")
             .arg(&output)
-            .env("CFG_BUILD", &builder.config.build)
-            .env("RUSTC_ERROR_METADATA_DST", builder.extended_error_dir());
+            .env("CFG_BUILD", &builder.config.build);
 
         builder.info(&format!("Testing error-index stage{}", compiler.stage));
         let _time = util::timeit(&builder);