diff --git a/src/librustc/diagnostics.rs b/src/librustc/diagnostics.rs
index 653ade67b72..b48df36a679 100644
--- a/src/librustc/diagnostics.rs
+++ b/src/librustc/diagnostics.rs
@@ -77,8 +77,6 @@ register_diagnostics! {
     E0138,
     E0139,
     E0152,
-    E0153,
-    E0157,
     E0158,
     E0161,
     E0162,
diff --git a/src/libsyntax/diagnostics/plugin.rs b/src/libsyntax/diagnostics/plugin.rs
index 0e99829fa1c..bd5247bbad6 100644
--- a/src/libsyntax/diagnostics/plugin.rs
+++ b/src/libsyntax/diagnostics/plugin.rs
@@ -9,7 +9,7 @@
 // except according to those terms.
 
 use std::cell::RefCell;
-use std::collections::HashMap;
+use std::collections::BTreeMap;
 use ast;
 use ast::{Ident, Name, TokenTree};
 use codemap::Span;
@@ -19,18 +19,18 @@ use parse::token;
 use ptr::P;
 
 thread_local! {
-    static REGISTERED_DIAGNOSTICS: RefCell<HashMap<Name, Option<Name>>> = {
-        RefCell::new(HashMap::new())
+    static REGISTERED_DIAGNOSTICS: RefCell<BTreeMap<Name, Option<Name>>> = {
+        RefCell::new(BTreeMap::new())
     }
 }
 thread_local! {
-    static USED_DIAGNOSTICS: RefCell<HashMap<Name, Span>> = {
-        RefCell::new(HashMap::new())
+    static USED_DIAGNOSTICS: RefCell<BTreeMap<Name, Span>> = {
+        RefCell::new(BTreeMap::new())
     }
 }
 
 fn with_registered_diagnostics<T, F>(f: F) -> T where
-    F: FnOnce(&mut HashMap<Name, Option<Name>>) -> T,
+    F: FnOnce(&mut BTreeMap<Name, Option<Name>>) -> T,
 {
     REGISTERED_DIAGNOSTICS.with(move |slot| {
         f(&mut *slot.borrow_mut())
@@ -38,7 +38,7 @@ fn with_registered_diagnostics<T, F>(f: F) -> T where
 }
 
 fn with_used_diagnostics<T, F>(f: F) -> T where
-    F: FnOnce(&mut HashMap<Name, Span>) -> T,
+    F: FnOnce(&mut BTreeMap<Name, Span>) -> T,
 {
     USED_DIAGNOSTICS.with(move |slot| {
         f(&mut *slot.borrow_mut())
diff --git a/src/test/debuginfo/vec-slices.rs b/src/test/debuginfo/vec-slices.rs
index 949dffaac06..3ceb3946f3c 100644
--- a/src/test/debuginfo/vec-slices.rs
+++ b/src/test/debuginfo/vec-slices.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // ignore-android: FIXME(#10381)
+// ignore-windows
 // min-lldb-version: 310
 
 // compile-flags:-g
diff --git a/src/test/run-pass/issue-20797.rs b/src/test/run-pass/issue-20797.rs
index c4f3c33f269..089b6f31975 100644
--- a/src/test/run-pass/issue-20797.rs
+++ b/src/test/run-pass/issue-20797.rs
@@ -8,6 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-android
+// ignore-windows
+
 // Regression test for #20797.
 
 use std::default::Default;