Documentation

Lean.Parser.Do

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          A doSeq is a sequence of doElem, the main argument after the do keyword and other do elements that take blocks. It can either have the form "{" (doElem ";"?)* "}" or many1Indent (doElem ";"?), where many1Indent ensures that all the items are at the same or higher indentation level as the first line.

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            termBeforeDo is defined as withForbidden("do", term), which will parse a term but disallows do outside of a bracketing construct. This is used for parsers like for _ in t do ... or unless t do ..., where we do not want t do ... to be parsed as an application of t to a do block, which would otherwise be allowed.

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                                                      for x in e do s iterates over e assuming e's type has an instance of the ForIn typeclass. break and continue are supported inside for loops. for x in e, x2 in e2, ... do s iterates of the given collections in parallel, until at least one of them is exhausted. The types of e2 etc. must implement the ToStream typeclass.

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                                                                  break exits the surrounding for loop.

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                                                                    continue skips to the next iteration of the surrounding for loop.

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                                                                      return e inside of a do block makes the surrounding block evaluate to pure e, skipping any further statements. Note that uses of the do keyword in other syntax like in for _ in _ do do not constitute a surrounding block in this sense; in supported editors, the corresponding do keyword of the surrounding block is highlighted when hovering over return.

                                                                      return not followed by a term starting on the same line is equivalent to return ().

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                                                                                  unless e do s is a nicer way to write if !e do s.

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                                                                                        return used outside of do blocks creates an implicit block around it and thus is equivalent to pure e, but helps with avoiding parentheses.

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