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Perl 6:maxpairs警告未定义值的字符串化

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看起来 maxpairs 不喜欢在具有未定义值的列表上调用:

> my @foo; @foo[2] = 4; say @foo.maxpairs;
Use of uninitialized value of type Any in string context.
Methods .^name, .perl, .gist, or .say can be used to stringify it to something meaningful.
  in block <unit> at <unknown file> line 1

(2 => 4)

max 没有相同的问题,似乎只是忽略未定义的值:

> my @foo; @foo[2] = 4; say @foo.max;
4

发生同样的错误:

> my @foo; @foo[2] = 4; say @foo.pairs.max(*.value)
Use of uninitialized value of type Any in string context.
Methods .^name, .perl, .gist, or .say can be used to stringify it to something meaningful.
  in block <unit> at <unknown file> line 1

2 => 4

因此,只有在没有过滤器参数的情况下使用 max 时,才会忽略未定义的值 .

这是一个错误吗?

1 回答

  • 5

    由于这看起来像一个bug,我已经修复了它

    https://github.com/rakudo/rakudo/commit/7bf7a2c6f83a57713c
    

    这也照顾“minpairs” .

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