For debugging, it's better to set the default rule to 
:default ::= action => [name,value]

[download]

Your problem is at the following line: 

haml        ::= comments | oneliners

[download]

Your example doesn't contain only comments or only oneliners, but a mix of both types. What you actually need is 

haml       ::= things
things     ::= thing+
thing      ::= oneliner | comment

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Handling of whitespace is weird. You didn't tell Marpa there could be whitespace between the tag and the body. Either do it explicitly, or try the implicit rule 

:discard ~ space
space    ~ [\s]+

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($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In reply to Re: baby Marpa::R2 haml Error in SLIF parse: No lexemes accepted by choroba
in thread baby Marpa::R2 haml Error in SLIF parse: No lexemes accepted by Anonymous Monk

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