link time error: multiple definition of method

[lbguilherme]

This code:

def a(x)
  x
end

class A
  def a(x)
    super x
  end
end

a "1"
A.new.a "2"

Causes:

A-.o: In function `a':
/home/guilherme/Cubos/sdkgen2/x.cr:3: multiple definition of `*a<String>:String'
_main.o:/home/guilherme/Cubos/sdkgen2/x.cr:3: first defined here
collect2: error: ld returned 1 exit status
Error: execution of command failed with code: 1: `cc "${@}" -o '/home/guilherme/.cache/crystal/crystal-run-x.tmp'  -rdynamic  -lpcre -lgc -lpthread /opt/crystal/src/ext/libcrystal.a -levent -lrt -ldl -L/usr/lib -L/usr/local/lib`

This happens on both lastest release (Crystal 0.23.1 [e2a1389] (2017-07-13) LLVM 3.8.1) and current master (Crystal 0.24.0 [ea4187c] (2017-10-28) LLVM 4.0.1).

Obviously the code makes no sense, there is no "super" to invoke. But it surely should report correct error. This is my expected output:

Error in x.cr:12: instantiating 'A#a(String)'

A.new.a "2"
      ^

in x.cr:7: undefined method 'a'

    super x
    ^~~~~