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-rw-r--r--src/libsyntax/diagnostics/plugin.rs3
-rw-r--r--src/libsyntax/ext/format.rs1
2 files changed, 2 insertions, 2 deletions
diff --git a/src/libsyntax/diagnostics/plugin.rs b/src/libsyntax/diagnostics/plugin.rs
index 620ac1280f4..54b09d863a3 100644
--- a/src/libsyntax/diagnostics/plugin.rs
+++ b/src/libsyntax/diagnostics/plugin.rs
@@ -200,9 +200,8 @@ pub fn expand_build_diagnostic_array<'cx>(ecx: &'cx mut ExtCtxt,
             ident: name.clone(),
             attrs: Vec::new(),
             id: ast::DUMMY_NODE_ID,
-            node: ast::ItemStatic(
+            node: ast::ItemConst(
                 ty,
-                ast::MutImmutable,
                 expr,
             ),
             vis: ast::Public,
diff --git a/src/libsyntax/ext/format.rs b/src/libsyntax/ext/format.rs
index 4fe5ab15545..86e72d4ef03 100644
--- a/src/libsyntax/ext/format.rs
+++ b/src/libsyntax/ext/format.rs
@@ -452,6 +452,7 @@ impl<'a, 'b> Context<'a, 'b> {
             Some(ecx.lifetime(sp, special_idents::static_lifetime.name)),
             ast::MutImmutable);
         let slice = ecx.expr_vec_slice(sp, pieces);
+        // static instead of const to speed up codegen by not requiring this to be inlined
         let st = ast::ItemStatic(ty, ast::MutImmutable, slice);
 
         let name = ecx.ident_of(name);