On Sat, 28 Jan 2017 16:42:46 -0800, mt1...@gmail.com wrote:
> Hi,
>
> I get the following error using version 2016.08.1-66-g1ff1aae built on
> MoarVM version 2016.08
> implementing Perl 6.c.
>
> Cannot resolve caller BUILD(CC+{RR}: ); none of these signatures match:
> (CC $: Str :$t!, *%_)
> (CC $: Int :$i!, *%_)
> in block <unit> at Build2.pl6 line 15
>
>
>
> The code which generates the error (on the line with '$c does RR');
>
>
> role RR { }
>
> class CC {
>
> multi submethod BUILD ( Str :$t! ) { }
> multi submethod BUILD ( Int :$i! ) { }
> }
>
> my CC $c .= new(:t<text1>);
> $c does RR;
>
>
> Removing the last line and add a trait 'does' to the class works but is
> not what I want.
>
> Greetings,
> Marcel
Some observations:
1) All submethods are affected and sticking `Any` or `Mu` into invocant doesn't
help (perhaps correctly, because these are *sub*methods?):
<Zoffix> m: role RR {}; class Foo { multi submethod foo($x) { $x.say } };
(Foo.new does RR).foo: 42
<camelia> rakudo-moar aac9ef: OUTPUT«Cannot resolve caller foo(Foo+{RR}:
Int); none of these signatures match: (Foo $: $x, *%_) in block <unit> at
<tmp> line 1»
<Zoffix> m: role RR {}; class Foo { multi submethod foo(Any: $x) { $x.say }
}; (Foo.new does RR).foo: 42
<camelia> rakudo-moar aac9ef: OUTPUT«Cannot resolve caller foo(Foo+{RR}:
Int); none of these signatures match: ($: $x, *%_) in block <unit> at
<tmp> line 1»
<Zoffix> m: role RR {}; class Foo { multi submethod foo(Mu $: $x) { $x.say }
}; (Foo.new does RR).foo: 42
<camelia> rakudo-moar aac9ef: OUTPUT«Cannot resolve caller foo(Foo+{RR}:
Int); none of these signatures match: (Mu $: $x, *%_) in block <unit> at
<tmp> line 1»
2) Functionality of multi submethods seems busted. For example here's the multi
no match error occurs:
<Zoffix> m: class Bar { multi submethod BUILD() {} }; class Foo is Bar
{}.new
<camelia> rakudo-moar aac9ef: OUTPUT«Cannot resolve caller BUILD(Foo: );
none of these signatures match: (Bar $: *%_) in block <unit> at <tmp>
line 1»
But goes away if we use the second class in the invocant:
<Zoffix> m: class Foo {…};class Bar { multi submethod BUILD(Foo:) {} };
class Foo is Bar {}.new
<camelia> rakudo-moar aac9ef: ( no output )
3) The multi build works in this configuration of being in role and class and
role being mixed in advance:
<Zoffix> m: role RR {multi submethod BUILD(:$x!) {say "role"}}; class Foo
does RR { multi submethod BUILD(:$y!) {say "hi"} }; Foo.new: :x
<camelia> rakudo-moar aac9ef: OUTPUT«role»
<Zoffix> m: role RR {multi submethod BUILD(:$x!) {say "role"}}; class Foo
does RR { multi submethod BUILD(:$y!) {say "hi"} }; Foo.new: :y
<camelia> rakudo-moar aac9ef: OUTPUT«hi»
As long as invocant marker matches the class the submethod's in:
<Zoffix> m: role RR {multi submethod BUILD(:$x!) {say "role"}}; class Foo
does RR { multi submethod BUILD($: :$y!) {say "hi"} }; Foo.new: :y
<camelia> rakudo-moar aac9ef: OUTPUT«Cannot resolve caller BUILD(Foo: :y);
none of these signatures match: ($: :$y!, *%_) (Foo $: :$x!, *%_) in
block <unit> at <tmp> line 1
4) Getting this weird error about two unnamed parameters, which happens only
when I use `:$` named in class and try to mix in a role that has another multi
with some named param. waat:
<Zoffix> m: class Foo { multi submethod BUILD(:$) {say "hi"} }; Foo.new
<camelia> rakudo-moar aac9ef: OUTPUT«hi»
<Zoffix> m: role RR {multi submethod BUILD() {say "role"}}; class Foo does
RR { multi submethod BUILD(:$) {say "hi"} }; Foo.new
<camelia> rakudo-moar aac9ef: OUTPUT«hi»
<Zoffix> m: role RR {multi submethod BUILD(:$x) {say "role"}}; class Foo
does RR { multi submethod BUILD(:$) {say "hi"} }; Foo.new
<camelia> rakudo-moar aac9ef: OUTPUT«===SORRY!=== Error while compiling
<tmp>Found named parameter '(unnamed)' twice in signature :(Foo $: $, *%_):
*%_ vs $at <tmp>:1»
