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Jul 1, 2025
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doc: typo in the grind manual #511

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2 changes: 1 addition & 1 deletion Manual/Grind.lean
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Expand Up @@ -432,7 +432,7 @@ and can then repeat the same reasoning to deduce `R a d` from `R a c` and `R c d

Instead of using `grind_pattern` to explicitly specify a pattern,
you can use the `@[grind]` attribute or one of its variants, which will use a heuristic to generate a (multi-)pattern.
The `@[grind?]` attribute displays an info message showing the pattern which was selected—this is very helpfully for debugging!
The `@[grind?]` attribute displays an info message showing the pattern which was selected—this is very helpful for debugging!

* `@[grind →]` will select a multi-pattern from the hypotheses of the theorem (i.e. it will use the theorem for forwards reasoning).
In more detail, it will traverse the hypotheses of the theorem from left-to-right, and each time it encounters a minimal indexable (i.e. has a constant as its head) subexpression which "covers" (i.e. fixes the value of) an argument which was not previously covered, it will add that subexpression as a pattern, until all arguments have been covered. This rule is described in more detail below.
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