Add range statements to golang grammar

examples/grammars/golang.cc

@@ -83,6 +83,7 @@ namespace tree_sitter_examples {
             sym("expression_statement"),
             sym("return_statement"),
             sym("declaration_statement"),
+            sym("range_statement"),
             sym("if_statement") }) },
         { "return_statement", seq({
             keyword("return"),
@@ -90,6 +91,14 @@ namespace tree_sitter_examples {
         { "declaration_statement", choice({
             sym("var_declaration"),
             seq({ comma_sep(sym("var_name")), str(":="), sym("expression") }) }) },
+        { "range_statement", seq({
+            keyword("for"),
+            sym("var_name"),
+            optional(seq({ str(","), sym("var_name") })),
+            str(":="),
+            keyword("range"),
+            sym("expression"),
+            sym("block_statement") }) },
         { "if_statement", seq({
             keyword("if"),
             sym("expression"),

spec/runtime/languages/golang/statements.txt

@@ -61,4 +61,26 @@ func main() {
         (if_statement (call_expression (var_name))
             (block_statement)
             (if_statement (call_expression (var_name))
-                (block_statement))))))
+                (block_statement))))))
+
+=============================================
+parses range statements
+=============================================
+package main
+
+func main() {
+    for k := range theMap() {
+        println(k)
+    }
+
+    for k, v := range theMap() {
+        println(k, v)
+    }
+}
+---
+(program (package_directive (package_name))
+    (func_declaration (var_name) (block_statement
+        (range_statement (var_name) (call_expression (var_name)) (block_statement
+            (expression_statement (call_expression (var_name) (var_name)))))
+        (range_statement (var_name) (var_name) (call_expression (var_name)) (block_statement
+            (expression_statement (call_expression (var_name) (var_name) (var_name))))))))