Function check_syntax 

pub fn check_syntax(language_tag: &str, source: &str) -> Result<(), SyntaxError>

Checks the syntax of source for the given language tag or name.

Returns Ok(()) if the syntax is valid or if the language is unknown / unsupported, or Err(SyntaxError) if a syntax error is discovered.

Errors

Returns SyntaxError if the source code contains syntax or parse errors.