lean4-htt/tests/lean/run/4230.lean
Marc Huisinga f180eee7bf
feat: use widget message for "try this" (#9966)
This PR adjusts the "try this" widget to be rendered as a widget message
under 'Messages', not a separate widget under a 'Suggestions' section.
The main benefit of this is that the message of the widget is not
duplicated between 'Messages' and 'Suggestions'.

Since widget message suggestions were already implemented by @jrr6 for
the new hint infrastructure, this PR replaces the old "try this"
implementation with the new hint infrastructure. In doing so, the
`style?` field of suggestions is deprecated, since the hint
infrastructure highlights hints using diff colors, and `style?` also
never saw much use downstream. Additionally, since the message and the
suggestion are now the same component, the `messageData?` field of
suggestions is deprecated as well. Notably, the "Try this:" message
string now also contains a newline and indentation to separate the
suggestion from the rest of the message more clearly and the `postInfo?`
field of the suggestion is now part of the message.

Finally, this PR changes the diff colors used by the hint infrastructure
to be more color-blindness-friendly (insertions are now blue, not green,
and text that remains unchanged is now using the editor foreground color
instead of blue).

### Breaking changes
Tests that use `#guard_msgs` to test the "Try this:" message may need to
be adjusted for the new formatting of the message.
2025-08-26 12:15:32 +00:00

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def copy (curr : Nat) (input : Array Nat) (output : Array Nat) : Array Nat :=
if hcurr:curr < input.size then
copy (curr + 1) input (output.push (input[curr]'hcurr))
else
output
termination_by input.size - curr
/--
info: Try this:
termination_by input.size - curr
-/
#guard_msgs(drop warning, info) in
theorem foo (curr : Nat) (input : Array Nat) (output : Array Nat)
: ∀ (idx : Nat) (hidx1 : idx < curr),
(copy curr input output)[idx]'sorry
=
output[idx]'sorry := by
intro idx hidx
unfold copy
split
. rw [foo]
. rw [Array.getElem_push_lt]
. omega
. rfl
termination_by?