2 files changed, 20 insertions, 11 deletions
diff --git a/compiler/rustc_expand/src/expand.rs b/compiler/rustc_expand/src/expand.rs
index 0f4441d020b..27274f706e1 100644
--- a/compiler/rustc_expand/src/expand.rs
+++ b/compiler/rustc_expand/src/expand.rs
@@ -491,6 +491,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
             let fragment_kind = invoc.fragment_kind;
             let (expanded_fragment, new_invocations) = match self.expand_invoc(invoc, &ext.kind) {
                 ExpandResult::Ready(fragment) => {
+                    let mut derive_invocations = Vec::new();
                     let derive_placeholders = self
                         .cx
                         .resolver
@@ -512,14 +513,14 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
                                 _ => unreachable!(),
                             };
 
-                            invocations.reserve(derives.len());
+                            derive_invocations.reserve(derives.len());
                             derives
                                 .into_iter()
                                 .map(|(path, _exts)| {
                                     // FIXME: Consider using the derive resolutions (`_exts`)
                                     // instead of enqueuing the derives to be resolved again later.
                                     let expn_id = ExpnId::fresh(None);
-                                    invocations.push((
+                                    derive_invocations.push((
                                         Invocation {
                                             kind: InvocationKind::Derive {
                                                 path,
@@ -546,7 +547,12 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
                         })
                         .unwrap_or_default();
 
-                    self.collect_invocations(fragment, &derive_placeholders)
+                    let (fragment, collected_invocations) =
+                        self.collect_invocations(fragment, &derive_placeholders);
+                    // We choose to expand any derive invocations associated with this macro invocation
+                    // *before* any macro invocations collected from the output fragment
+                    derive_invocations.extend(collected_invocations);
+                    (fragment, derive_invocations)
                 }
                 ExpandResult::Retry(invoc) => {
                     if force {
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index 75bd8880b34..b6b349e4a80 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -18,7 +18,7 @@ use rustc_serialize::json;
 
 use crate::parse::CrateConfig;
 use rustc_feature::UnstableFeatures;
-use rustc_span::edition::{Edition, DEFAULT_EDITION, EDITION_NAME_LIST};
+use rustc_span::edition::{Edition, DEFAULT_EDITION, EDITION_NAME_LIST, LATEST_STABLE_EDITION};
 use rustc_span::source_map::{FileName, FilePathMapping};
 use rustc_span::symbol::{sym, Symbol};
 use rustc_span::SourceFileHashAlgorithm;
@@ -1320,13 +1320,16 @@ pub fn parse_crate_edition(matches: &getopts::Matches) -> Edition {
     };
 
     if !edition.is_stable() && !nightly_options::is_unstable_enabled(matches) {
-        early_error(
-            ErrorOutputType::default(),
-            &format!(
-                "edition {} is unstable and only available with -Z unstable-options.",
-                edition,
-            ),
-        )
+        let is_nightly = nightly_options::match_is_nightly_build(matches);
+        let msg = if !is_nightly {
+            format!(
+                "the crate requires edition {}, but the latest edition supported by this Rust version is {}",
+                edition, LATEST_STABLE_EDITION
+            )
+        } else {
+            format!("edition {} is unstable and only available with -Z unstable-options", edition)
+        };
+        early_error(ErrorOutputType::default(), &msg)
     }
 
     edition