:) I know this probably doesn't qualify also (and you probably saw it) , but GraphViz2::Marpa is not by Marpa author :) though it is also accompanied by how-to article

FWIW, Marpa guy does give some praise for his error diagnostics on his blog :)

In reply to Re^3: Block-structured language parsing using a Perl module? by Anonymous Monk
in thread Block-structured language parsing using a Perl module? by BrowserUk

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