1b6572726f
Adds a mechanism where when an autoparam tactic fails to synthesize a parameter, the associated parameter name or field name for the autoparam is reported in an error. Examples: ```text could not synthesize default value for parameter 'h' using tactics could not synthesize default value for field 'inv' of 'S' using tactics ``` Notes: * Autoparams now run their tactics without any error recovery or error-to-sorry enabled. This enables catching the error and reporting the contextual information. This is justified on the grounds that autoparams are not interactive. * Autoparams for applications now cleanup the autoParam annotation, bringing it in line with autoparams for structure fields. * This preserves the old behavior that autoparams leave terminfo, but we will revisit this after some imminent improvements to the unused variable linter. Closes #2950
48 lines
906 B
Text
48 lines
906 B
Text
/-!
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# Testing the autoparam feature
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-/
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def f (x y : Nat) (h : x = y := by assumption) : Nat :=
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x + x
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def g (x y z : Nat) (h : x = y) : Nat :=
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f x y
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def f2 (x y : Nat) (h : x = y := by exact rfl) : Nat :=
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x + x
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def f3 (x y : Nat) (h : x = y := by exact Eq.refl x) : Nat :=
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x + x
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#check fun x => f2 x x
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#check fun x => f3 x x
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/--
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error: could not synthesize default value for parameter 'h' using tactics
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---
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error: tactic 'assumption' failed
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⊢ 1 = 2
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-/
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#guard_msgs in example := f 1 2
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/-!
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From #2950, field autoparam should mention which field failed.
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-/
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structure Foo where
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val : String
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len : Nat := val.length
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inv : val.length = len := by next => decide
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/--
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error: could not synthesize default value for field 'inv' of 'Foo' using tactics
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---
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error: tactic 'decide' proved that the proposition
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"abc".length = 5
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is false
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-/
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#guard_msgs in
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def test2 : Foo := {
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val := "abc"
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len := 5
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}
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