Makes only contextual

Author: CrooseGit

compiler/rustc_span/src/symbol.rs

@@ -61,7 +61,6 @@ symbols! {
         Mod:                "mod",
         Move:               "move",
         Mut:                "mut",
-        Only:               "only",
         Pub:                "pub",
         Ref:                "ref",
         Return:             "return",
@@ -130,6 +129,7 @@ symbols! {
         ContractRequires:   "contract_requires",
         Default:            "default",
         MacroRules:         "macro_rules",
+        Only:               "only",
         Raw:                "raw",
         Reuse:              "reuse",
         Safe:               "safe",