407a59d697
This PR modifies the pretty printing of pi types. Now `∀` will be preferred over `→` for propositions if the domain is not a proposition. For example, `∀ (n : Nat), True` pretty prints as `∀ (n : Nat), True` rather than as `Nat → True`. There is also now an option `pp.foralls` (default true) that when false disables using `∀` at all, for pedagogical purposes. This PR also adjusts instance implicit binder pretty printing — nondependent pi types won't show the instance binder name. Closes #1834. The linked RFC also suggests using `_` for binder names in case of non-dependance. We're tabling that idea. Potentially it is useful for hygienic names; this could improve how `Nat → True` pretty prints as `∀ (a : Nat), True`, with this `a` that's chosen by implication notation elaboration. Relatedly, this PR exposes even further the issue where binder names are reused in a confusing way. Consider: `Nat → Nat → (a : Nat) → a = a` pretty prints as `∀ (a a a : Nat), a = a`.
127 lines
4.1 KiB
Text
127 lines
4.1 KiB
Text
b 0
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b 1
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b 2
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b 2.5
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t 0
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t 1
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t 2
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t 2
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{"version": 3,
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"uri": "file:///incrementalTactic.lean",
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"diagnostics":
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[{"source": "Lean 4",
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"severity": 1,
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"range":
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{"start": {"line": 4, "character": 12}, "end": {"line": 4, "character": 13}},
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"message":
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"tactic 'introN' failed, insufficient number of binders\na n : Nat\n⊢ True",
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"fullRange":
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{"start": {"line": 4, "character": 12},
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"end": {"line": 4, "character": 13}}},
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{"source": "Lean 4",
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"severity": 1,
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"range":
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{"start": {"line": 2, "character": 22}, "end": {"line": 3, "character": 0}},
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"message": "unsolved goals\nthis : ∀ (a a : Nat), True\n⊢ True",
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"leanTags": [1],
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"fullRange":
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{"start": {"line": 2, "character": 22},
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"end": {"line": 10, "character": 11}}}]}
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{"version": 1,
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"uri": "file:///incrementalTactic.lean",
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"diagnostics":
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[{"source": "Lean 4",
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"severity": 1,
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"range":
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{"start": {"line": 1, "character": 38}, "end": {"line": 4, "character": 3}},
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"message": "unexpected token '/-!'; expected ')', '_', identifier or term",
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"fullRange":
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{"start": {"line": 1, "character": 38},
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"end": {"line": 4, "character": 3}}}]}
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{"version": 1,
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"uri": "file:///incrementalTactic.lean",
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"diagnostics":
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[{"source": "Lean 4",
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"severity": 1,
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"range":
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{"start": {"line": 2, "character": 9}, "end": {"line": 2, "character": 11}},
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"message": "unknown identifier 'no'",
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"fullRange":
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{"start": {"line": 2, "character": 9}, "end": {"line": 2, "character": 11}}},
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{"source": "Lean 4",
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"severity": 1,
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"range":
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{"start": {"line": 3, "character": 9}, "end": {"line": 3, "character": 16}},
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"message": "unsolved goals\n⊢ Nat",
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"leanTags": [1],
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"fullRange":
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{"start": {"line": 3, "character": 9},
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"end": {"line": 3, "character": 16}}}]}
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s
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{ goals := #[{ type := Lean.Widget.TaggedText.tag
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{ subexprPos := "/", diffStatus? := none }
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(Lean.Widget.TaggedText.text "True"),
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isInserted? := some false,
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isRemoved? := none,
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hyps := #[] }] }
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{"version": 1,
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"uri": "file:///incrementalTactic.lean",
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"diagnostics":
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[{"source": "Lean 4",
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"severity": 1,
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"range":
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{"start": {"line": 2, "character": 8}, "end": {"line": 2, "character": 25}},
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"message":
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"tactic 'rewrite' failed, did not find instance of the pattern in the target expression\n 0\n⊢ True",
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"fullRange":
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{"start": {"line": 2, "character": 8},
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"end": {"line": 2, "character": 25}}}]}
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{"version": 1,
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"uri": "file:///incrementalTactic.lean",
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"diagnostics":
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[{"source": "Lean 4",
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"severity": 1,
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"range":
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{"start": {"line": 3, "character": 12}, "end": {"line": 3, "character": 16}},
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"message": "unsolved goals\ncase zero\n⊢ True",
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"leanTags": [1],
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"fullRange":
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{"start": {"line": 3, "character": 12},
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"end": {"line": 3, "character": 16}}}]}
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{"version": 2,
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"uri": "file:///incrementalTactic.lean",
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"diagnostics":
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[{"source": "Lean 4",
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"severity": 1,
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"range":
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{"start": {"line": 2, "character": 6}, "end": {"line": 2, "character": 10}},
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"message": "unsolved goals\n⊢ True",
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"leanTags": [1],
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"fullRange":
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{"start": {"line": 2, "character": 6}, "end": {"line": 2, "character": 10}}},
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{"source": "Lean 4",
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"severity": 1,
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"range":
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{"start": {"line": 3, "character": 4}, "end": {"line": 3, "character": 10}},
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"message": "no goals to be solved",
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"fullRange":
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{"start": {"line": 3, "character": 4}, "end": {"line": 3, "character": 10}}},
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{"source": "Lean 4",
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"severity": 1,
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"range":
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{"start": {"line": 4, "character": 2}, "end": {"line": 4, "character": 8}},
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"message": "no goals to be solved",
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"fullRange":
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{"start": {"line": 4, "character": 2}, "end": {"line": 4, "character": 8}}}]}
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{"version": 2,
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"uri": "file:///incrementalTactic.lean",
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"diagnostics":
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[{"source": "Lean 4",
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"severity": 1,
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"range":
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{"start": {"line": 3, "character": 8}, "end": {"line": 3, "character": 21}},
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"message": "unknown identifier 'noSuchTheorem'",
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"fullRange":
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{"start": {"line": 3, "character": 8},
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"end": {"line": 3, "character": 21}}}]}
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