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[BLOCK1]
  KEY1=VALUE1
...
[BLOCK2]
  KEY1=VALUE1
  KEY2=VALUE2

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#!/usr/bin/perl
use warnings;
...
    warn( "Parameter '$_' is missing from INI!\n" )
      unless exists $config{$_};
}

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```
foo 'test'
baz 'test-2'
```

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Parameter 'bar' is missing from INI!
Parameter 'quux' is missing from INI!

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#!/usr/bin/perl
use warnings;
...
    warn( "Parameter '$_' is missing from INI!\n" )
      unless exists $config{'requirements.%test-2'};
}

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[requirements]
@test=('bar' 'baz')
%test-2=( bar => 1 , baz => 2 )
test_foo='foo'
quux_test='quux'

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Requirements foo
Requirements Array (bar baz)
...
Parameter 'bar' is missing from INI!
Parameter 'baz' is missing from INI!
Parameter 'quux' is missing from INI!