lean4-htt/tests/lean/run/8067.lean at f759d5dbc1aa18b36bb0affeaeb6ea094fde33db - max/lean4-htt - maxgit: wireguard access, git repository.

max/lean4-htt

Rob23oba b5cfd86a89

fix: Substring.isNat for empty string (#8067 )

This PR fixes the behavior of `Substring.isNat` to disallow empty
strings.

Closes #8005

2025-04-29 15:54:29 +00:00

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	`#guard !"".toSubstring.isNat`
	`#guard !"-".isInt`
	`#guard "-".toInt? = none`