highlight in with the same color as for

Author: rhysd

syntax/rust.vim

@@ -21,6 +21,7 @@ syn match     rustRepeat /\<for\>/
 " Highlight `for` keyword in `impl ... for ... {}` statement. This line must
 " be put after previous `syn match` line to overwrite it.
 syn match     rustKeyword /\%(\<impl\>.\+\)\@<=\<for\>/
+syn keyword   rustRepeat in
 syn keyword   rustTypedef type nextgroup=rustIdentifier skipwhite skipempty
 syn keyword   rustStructure struct enum nextgroup=rustIdentifier skipwhite skipempty
 syn keyword   rustUnion union nextgroup=rustIdentifier skipwhite skipempty contained
@@ -38,7 +39,7 @@ syn keyword   rustKeyword     continue
 syn keyword   rustKeyword     crate
 syn keyword   rustKeyword     extern nextgroup=rustExternCrate,rustObsoleteExternMod skipwhite skipempty
 syn keyword   rustKeyword     fn nextgroup=rustFuncName skipwhite skipempty
-syn keyword   rustKeyword     in impl let
+syn keyword   rustKeyword     impl let
 syn keyword   rustKeyword     macro
 syn keyword   rustKeyword     pub nextgroup=rustPubScope skipwhite skipempty
 syn keyword   rustKeyword     return