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mutate_grammar_start_rule

meta_language::grammar::round_trip

Function mutate_grammar_start_rule 

Source 
pub fn mutate_grammar_start_rule(
    grammar: &Grammar,
    marker: &str,
) -> Result<Grammar, GrammarRoundTripError>
Expand description

Adds marker as a literal alternative of the start rule.

PEG grammars get an ordered choice, every other notation an unordered one, so the mutation is expressible without a lossy fallback.