Add support for 'select' loops.

corpus/statements.txt

@@ -125,6 +125,41 @@ done
         name: (variable_name)
         value: (raw_string)))))
 
+====================================
+Select statements
+====================================
+
+select choice in X Y $(ls); do
+  echo $choice
+  break
+done
+
+select ARG; do
+  echo $ARG
+  ARG=''
+done
+
+---
+
+(program
+  (for_statement
+    (variable_name)
+      (word)
+      (word)
+      (command_substitution (command (command_name (word))))
+    (do_group
+      (command
+        (command_name (word))
+        (simple_expansion (variable_name)))
+      (command (command_name (word)))))
+  (for_statement
+    (variable_name)
+    (do_group
+      (command
+        (command_name (word))
+        (simple_expansion (variable_name)))
+      (variable_assignment (variable_name) (raw_string)))))
+
 ====================================
 C-style for statements
 ====================================

grammar.js

@@ -114,7 +114,7 @@ module.exports = grammar({
     )),
 
     for_statement: $ => seq(
-      'for',
+      choice('for', 'select'),
       field('variable', $._simple_variable_name),
       optional(seq(
         'in',