Ok, thanks for testing it.
Here is the item in the bug tracker [1].

[1] http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24454

On 17. September 2016 15:07:15 GMT+00:00, David Pirotte <david@altosw.be> wrote:
>Hello Jan,
>
>>      (use-modules (oop goops))
>>      (define-generic native-type)
>>      (define-method (native-type (i <integer>) . args) 0)
>>      (define-method (native-type (i <real>) . args) 1)
>>      (define-method (native-type (b <boolean>) . args) 2)
>> 
>>      (native-type 1)
>>      (native-type 1.3)
>>      (native-type #f)
>>      (native-type 1 1.2)
>>      (native-type 1.4 2)
>>      (native-type 1.4 2 3)
>
>This works fine using 2.0.12, but indeed it fails using master [2.1.4
>here]
>
>Please report bug,  bug-guile at gnu dot org, with this snipset and the
>bug trace,
>mentioning it works using 2.0.12, fails using master.
>
>David

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