Files
lean4/tests/elab_fail/scopedLocalInsts.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

37 lines
755 B
Lean4

structure A where
x : Nat
y : Nat
namespace Foo
scoped instance : ToString A where
toString a := s!"A.mk {a.x} {a.y}"
end Foo
#eval toString { x := 10, y := 20 : A } -- Error: failed to synthesize `ToString A`
section Sec1
open Foo
#eval toString { x := 10, y := 20 : A } -- works
end Sec1 -- scoped instance `ToString A` is not available anymore
#eval toString { x := 10, y := 20 : A } -- Error
section Sec2
local instance : ToString A where
toString a := s!"\{ x := {a.x}, y := {a.y} }"
#eval toString { x := 10, y := 20 : A } -- works, using local instance
end Sec2 -- local instance `ToString A` is not available anymore
#eval toString { x := 10, y := 20 : A } -- Error
open Foo
#eval toString { x := 10, y := 20 : A } -- works