Type error for syntax `match` appears within pattern itself

Prerequisites

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Description

A syntax quotation match doesn't appear to be setting the types of the pattern variables in a strong enough way to prevent type errors from propagating into the matching code.

Context

#lean4 > weird type mismatch error location @ 💬

Steps to Reproduce

Consider

import Lean
open Lean Elab Meta Command Tactic

syntax foo := (ppSpace "(" ident " foo " tactic ")" )*

structure Foo where
set_option trace.Elab.match_syntax true
def elabFoo : Syntax → CommandElabM Unit
  | `(foo| $[($ids foo $tac)]*) => do
    let mut userArgs : NameMap (TSyntax `term) := {}
    for (name, t) in (ids.map (·.getId)).zip tac do
      userArgs := userArgs.insert name t
  | _ => throwUnsupportedSyntax

There is a type error since according to the pattern, tac : TSyntax `tactic, but according to the Array.zip, we have tac : TSyntax `term.

Expected behavior: The type error appears on the tac argument to zip.

Actual behavior: The type error appears on tac in the syntax quotation.

Versions

Lean 4.19.0-rc2
Target: x86_64-unknown-linux-gnu

Impact

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Start with the minimal reproducer in the issue, especially the elabFoo syntax quotation and the trace.Elab.match_syntax output. Investigate how the quotation assigns types to pattern variables before Array.zip; done means the diagnostic points to the tac argument of zip rather than the quotation pattern.