rickychilcott / crystal

The Crystal Programming Language

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crystal's Issues

Calling a referenced proc, in a macro contained within a namespaced class

I was able to find an issue that crops up when you are building a macro that references a method, as a proc, and tries to call in that context. When it's wrapped in a module it's broken, but when it's not wrapped in a module it's fine.

module TestMod
  class TestClass
    def self.test_method
      puts "Do something"
    end

    macro build_proc_method(name)
      def self.{{name}}_as_proc
        ->self.{{name}}.call
      end
    end

    build_proc_method(test_method)
  end
end

TestMod::TestClass.test_method_as_proc

I get the following error message:

Syntax error in expanded macro: build_proc_method:2: unexpected token: .

        ->self.test_method.call

When it's not wrapped in a module, everything works as expected. For instance:

class TestClass
  def self.test_method
    puts "Do something"
  end

  macro build_proc_method(name)
    def self.{{name}}_as_proc
      ->self.{{name}}.call
    end
  end

  build_proc_method(test_method)
end

TestClass.test_method_as_proc

Crystal 0.26.1 (2018-08-27)
LLVM: 6.0.1
Default target: x86_64-apple-macosx