fix: remove incorrect assertion at Sym/Simp/Have.lean#13611
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This PR removes an incorrect assertion in the simproc used to simplify `have`-expressions in `Sym.simp`.
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This PR fixes an assertion failure in
Sym.simpwhen simplifying ahave-expression whose binder type depends on a preceding binder in the telescope.The simproc that beta-applies a chain of nested non-dependent
let-expressions previously asserted that each binder typetcontained no loose bound variables. This assumption is not valid: a later binder's type may refer to earlierhave-binders. The fix instantiatestwith the accumulated bindersxsbefore introducing the new local declaration.