Add declarations w/o initialization to golang grammar

examples/grammars/golang.cc

@@ -36,8 +36,12 @@ namespace tree_sitter_examples {
         { "var_declaration", terminated(seq({
             keyword("var"),
             sym("var_name"),
-            str("="),
-            sym("expression") })) },
+            choice({
+                seq({
+                    optional(sym("type_expression")),
+                    str("="),
+                    sym("expression") }),
+                sym("type_expression") }) })) },
         { "func_declaration", terminated(seq({
             keyword("func"),
             sym("var_name"),

spec/runtime/languages/golang/declarations.txt

@@ -13,6 +13,19 @@ func z() {}
     (var_declaration (var_name) (string))
     (func_declaration (var_name) (statement_block)))
 
+==========================================
+parses var declarations
+==========================================
+package trivial
+
+var X struct { Y int64 }
+var Z = ""
+---
+(program
+    (package_directive (package_name))
+    (var_declaration (var_name) (struct_type (var_name) (type_name)))
+    (var_declaration (var_name) (string)))
+
 ==========================================
 parses comments
 ==========================================