RFC3239: Implement compact cfg(target(..))

compiler/rustc_span/src/symbol.rs

@@ -427,6 +427,7 @@ symbols! {
         cfg_panic,
         cfg_sanitize,
         cfg_target_abi,
+        cfg_target_compact,
         cfg_target_feature,
         cfg_target_has_atomic,
         cfg_target_has_atomic_equal_alignment,
@@ -1375,6 +1376,7 @@ symbols! {
         sym,
         sync,
         t32,
+        target,
         target_abi,
         target_arch,
         target_endian,