Rust indent after standalone where

rc/filetype/rust.kak

@@ -83,6 +83,8 @@ define-command -hidden rust-indent-on-new-line %~
             try %[ execute-keys -draft k <a-x> <a-k> [{(]\h*$ <ret> j <a-gt> ]
             # indent after lines ending with [{(].+ and move first parameter to own line
             try %< execute-keys -draft [c[({],[)}] <ret> <a-k> \A[({][^\n]+\n[^\n]*\n?\z <ret> L i<ret><esc> <gt> <a-S> <a-&> >
+            # indent lines with a standalone where
+            try %+ execute-keys -draft k <a-x> <a-k> ^\h*where\h*$ <ret> j <a-gt> +
             # dedent after lines starting with . and ending with , or ;
             try %_ execute-keys -draft k <a-x> <a-k> ^\h*\..*[,<semicolon>]\h*$ <ret> j <a-lt> _
             # todo dedent additional unmatched parenthesis

test/indent/rust/after-where/cmd

@@ -0,0 +1 @@
+c<ret>bar<esc>

test/indent/rust/after-where/in

@@ -0,0 +1,5 @@
+    impl X for T where%( )
+
+    impl X for T
+    where%( )
+

test/indent/rust/after-where/out

@@ -0,0 +1,7 @@
+    impl X for T where
+    bar
+
+    impl X for T
+    where
+        bar
+

test/indent/rust/after-where/rc

@@ -0,0 +1,3 @@
+source "%val{runtime}/colors/default.kak"
+source "%val{runtime}/rc/filetype/rust.kak"
+set buffer filetype rust