Can't change block context if defined within module context

[jhass]

class Foo
  def foo
    p "hi"
  end
end

def a
  with Foo.new yield
end

module Bar
  a do
    foo
  end
end

Error in /home/jhass/projects/crystal/with.cr:12: instantiating 'a()'

  a do
  ^

in /home/jhass/projects/crystal/with.cr:12: instantiating 'a()'

  a do
  ^

in /home/jhass/projects/crystal/with.cr:13: undefined local variable or method 'foo'

    foo

[asterite]

I'm starting to think that with ... yield is not a very good idea :-P

[jhass]

Yet the only way to make any sensible DSL possible that doesn't put all methods into the global namespace.

[asterite]

But you can always carry the object as a block argument. More verbose but it's much easier to understand the code and doesn't lead to ambiguities.

[jhass]

I'm toying with a testsuite implementation that's closer to something like RSpec 3, so run order randomization, possibly single context execution, minimal global methods or core extensions, before/after callbacks and so on.
You wouldn't want a test syntax that's

Spec.describe "foo" do |c|
  c.context "bar" do |c|
   c.before(:each) do |b|
     @foo = true
   end
    c.it "baz" do |e|
      e.expect(@foo).to e.be_false
    end
  end
end

Or would you?

[asterite]

I guess not :-)

[asterite]

We also have code in our specs that uses that feature, something like:

assert_type("1 + 2") { int32 }

So, yes, it's a nice feature to have.