fb462fdf9e
This PR adds improves the "invalid named argument" error message in function applications and match patterns by providing clickable hints with valid argument names. In so doing, it also fixes an issue where this error message would erroneously flag valid match-pattern argument names.
67 lines
1.7 KiB
Text
67 lines
1.7 KiB
Text
/-! # Errors in match patterns
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This file tests various error messages that arise from missing, extra, uninferrable, or otherwise
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erroneous arguments in match patterns.
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-/
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inductive T where
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| exp (a b c : Nat)
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| imp {a b c : Nat}
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| mix {a b : Nat} (c : Nat)
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/-- error: Invalid pattern: Too many arguments to 'exp'; expected 3 explicit arguments -/
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#guard_msgs in
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def T.mixNamedPositional₁ : T → Unit
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| exp (b := x) y z w => ()
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| _ => ()
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/-- error: Invalid pattern: Too many arguments to 'imp'; expected 0 explicit arguments -/
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#guard_msgs in
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def T.mixNamedPositional₂ : T → Unit
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| imp (a := x) y => ()
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| _ => ()
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/--
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error: Invalid pattern: Not enough arguments to 'imp'; expected 3 arguments
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Hint: To ignore all remaining arguments, use the ellipsis notation `..`
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-/
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#guard_msgs in
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def T.mixNamedPositional₃ : T → Unit
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| @imp (a := x) y => ()
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| _ => ()
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/-- error: Invalid pattern: Too many arguments to 'mix'; expected 1 explicit argument -/
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#guard_msgs in
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def T.mixNamedPositional₄ : T → Unit
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| mix (b := x) y z => ()
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| _ => ()
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def matchExplicitValid (n : Nat) :=
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match n with
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| @Nat.zero => ()
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| _ => ()
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/-- error: Invalid pattern variable: Variable name 'xs' was already used -/
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#guard_msgs in
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def dupVar (xs : List Nat) : List Nat :=
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match xs with
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| List.cons xs xs => true
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| _ => false
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/--
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error: Invalid pattern variable: Variable name must be atomic, but 'x.y' has multiple components
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-/
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#guard_msgs in
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def compVarName : Unit × Unit → Unit
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| (_, x.y) => x.y
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/--
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error: Invalid match expression: This pattern contains metavariables:
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[]
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-/
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#guard_msgs in
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def List.len x :=
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match x with
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| [] => 0
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| _ :: xs => 1 + len xs
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