error in tuple matching using variables
Reported by Philipp Pirozhkov | December 10th, 2008 @ 03:40 AM
module Retem
def simple((~number, val))
val
>> Retem.simple((~number, 3))
=> 3
>> v=(~number, 3)
=> (~number,3)
>> Retem.simple(v)
exception error: no function clause matching 'Retem':simple({number,3})
in function erl_eval:do_apply/5
in call from reia_erl:erl_funcall/3
in call from 'Eval':exprs/2
looks like that a tuple is not wrapped by e2r here, "{tuple,...}" is missing
Comments and changes to this ticket
-
Jared Kuolt December 10th, 2008 @ 12:20 PM
Note that it works if you pass the actual tuple itself:
@@@$ bin/ire Reia Interactive Shell (prerelease) Running on Erlang (BEAM) emulator version 5.6.3 [source] [64-bit] [smp:4] [async-threads:0] [kernel-poll:true]
module Retem .. def simple((~number, val)) .. val .. => ~ok Retem.simple((~number, 1)) => 1 v = (~number, 1)
=> (~number,1) Retem.simple(v) exception error: no function clause matching 'Retem':simple({number,1}) in function erl_eval:do_apply/5 in call from reia_erl:erl_funcall/3 in call from 'Eval':exprs/2 -
Jared Kuolt December 10th, 2008 @ 12:22 PM
Ugh. Stupid formatted. Let's try that again:
$ bin/ire Reia Interactive Shell (prerelease) Running on Erlang (BEAM) emulator version 5.6.3 [source] [64-bit] [smp:4] [async-threads:0] [kernel-poll:true] >> module Retem .. def simple((~number, val)) .. val .. => ~ok >> Retem.simple((~number, 1)) => 1 >> v = (~number, 1) => (~number,1) >> Retem.simple(v) exception error: no function clause matching 'Retem':simple({number,1}) in function erl_eval:do_apply/5 in call from reia_erl:erl_funcall/3 in call from 'Eval':exprs/2 -
Philipp Pirozhkov December 10th, 2008 @ 01:46 PM
Yes, thanks! I've included this piece of code especially to show that it works fine if we are passing the value, not the variable. The second case shows the problem itself. Besides, ticket title speaks for itself.
-
Tony Arcieri December 10th, 2008 @ 01:57 PM
- State changed from “new” to “resolved”
This is a duplicate of #10 Tuples are broken when using Eval
-
Tony Arcieri December 10th, 2008 @ 01:59 PM
Note that this problem does not occur in compiled expressions:
>> module Foo .. def bar .. val = (~number, 3) .. baz(val) .. def baz((~number, val)) .. val .. => ~ok >> Foo.bar() => 3It only occurs when the expressions are evaluated because the tuple value bound to the variable is being clobbered.
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Reia a dynamic scripting language for the Erlang virtual machine (BEAM)
Philipp Pirozhkov