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lean4/tests/elab/matchPatternVarErrors.lean
Garmelon 08eb78a5b2 chore: switch to new test/bench suite (#12590)
This PR sets up the new integrated test/bench suite. It then migrates
all benchmarks and some related tests to the new suite. There's also
some documentation and some linting.

For now, a lot of the old tests are left alone so this PR doesn't become
even larger than it already is. Eventually, all tests should be migrated
to the new suite though so there isn't a confusing mix of two systems.
2026-02-25 13:51:53 +00:00

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/-! # Errors in match patterns
This file tests various error messages that arise from missing, extra, uninferrable, or otherwise
erroneous arguments in match patterns.
-/
inductive T where
| exp (a b c : Nat)
| imp {a b c : Nat}
| mix {a b : Nat} (c : Nat)
/-- error: Invalid pattern: Too many arguments to `exp`; expected 3 explicit arguments -/
#guard_msgs in
def T.mixNamedPositional₁ : T Unit
| exp (b := x) y z w => ()
| _ => ()
/-- error: Invalid pattern: Too many arguments to `imp`; expected 0 explicit arguments -/
#guard_msgs in
def T.mixNamedPositional₂ : T Unit
| imp (a := x) y => ()
| _ => ()
/--
error: Invalid pattern: Not enough arguments to `imp`; expected 3 arguments
Hint: To ignore all remaining arguments, use the ellipsis notation `..`
-/
#guard_msgs in
def T.mixNamedPositional₃ : T Unit
| @imp (a := x) y => ()
| _ => ()
/-- error: Invalid pattern: Too many arguments to `mix`; expected 1 explicit argument -/
#guard_msgs in
def T.mixNamedPositional₄ : T Unit
| mix (b := x) y z => ()
| _ => ()
def matchExplicitValid (n : Nat) :=
match n with
| @Nat.zero => ()
| _ => ()
/-- error: Invalid pattern variable: Variable name `xs` was already used -/
#guard_msgs in
def dupVar (xs : List Nat) : List Nat :=
match xs with
| List.cons xs xs => true
| _ => false
/--
error: Invalid pattern variable: Variable name must be atomic, but `x.y` has multiple components
-/
#guard_msgs in
def compVarName : Unit × Unit Unit
| (_, x.y) => x.y
/--
error: Invalid match expression: This pattern contains metavariables:
[]
-/
#guard_msgs in
def List.len x :=
match x with
| [] => 0
| _ :: xs => 1 + len xs