Function parseError

If any of the parsers fail, this parser throws an error. This can be handy for showing more specific error messages to users. For example, if you have a parser that parses these two statements:

import "foo";
greet "name"
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And the user gives this input:

import;
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You don't want the parser to fail with a generic message, such as 'all parsers have failed'. You want a more specific error, such as 'expected string after import keyword'.

You could accomplish that with throwErrorUnless:

const parser = seqC(
  str("import"),
  captureCaptures(
    throwErrorUnless(
      "expected string after `import` keyword",
      spaces,
      capture(quotedString, "moduleName")
    )
  )
)
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