Fix ASTNode#to_s for {% verbatim do %} ... {% end %} (crystal-lan…

…g#6665)

For example, it shows wrong result.

Code:

    p!({% verbatim do %}1{{2}}3{% end %})

Result:

    {% verbatim do %}1
    {{ 2 }}
    3
    {% end %} # => 3

This commit fixes it.

spec/compiler/parser/to_s_spec.cr

@@ -150,6 +150,7 @@ describe "ASTNode#to_s" do
   expect_to_s "1.&*"
   expect_to_s "1.&**"
   expect_to_s "1.~(2)"
+  expect_to_s %({% verbatim do %}\n  1{{ 2 }}\n  3{{ 4 }}\n{% end %})
   expect_to_s %({% for foo in bar %}\n  {{ if true\n  foo\n  bar\nend }}\n{% end %})
   expect_to_s %(asm("nop" ::::))
   expect_to_s %(asm("nop" : "a"(1), "b"(2) : "c"(3), "d"(4) : "e", "f" : "volatile", "alignstack", "intel"))

src/compiler/crystal/syntax/to_s.cr

@@ -808,7 +808,9 @@ module Crystal
 
     def visit(node : MacroVerbatim)
       @str << "{% verbatim do %}"
-      node.exp.accept self
+      inside_macro do
+        node.exp.accept self
+      end
       @str << "{% end %}"
       false
     end