[erlang-questions] Did Erlang's grammar change in R16A?

Evan Miller <>
Thu Feb 14 20:03:56 CET 2013


As I understood it, dots are legal in unquoted atom names. This
appears not to be the case in R16A. Is this intentional?


Erlang R15B03 (erts-5.9.3.1) [source] [smp:8:8] [async-threads:0]
[hipe] [kernel-poll:false]

Eshell V5.9.3.1  (abort with ^G)
1> a.b.
'a.b'
2>


Erlang R16A (erts-5.10) [source] [smp:8:8] [async-threads:10] [hipe]
[kernel-poll:false]

Eshell V5.10  (abort with ^G)
1> a.b.
* 1: syntax error before: '.'
1>


Kai Janson noticed this because the "mongodb" package fails to compile
under R16A due to a syntax error on an atom with a dot in it.

https://github.com/mongodb/mongodb-erlang

I couldn't find any mention of changing the grammar in the README. Is
this a bug?

Evan



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