Infer-from-usage should find references of related tokens

Based on code in acorn:

var TokenType = function TokenType(label, conf) {
  this.label = label
  this.binop = conf.binop || null
}

/**
 * @param {string} name
 * @param {number} prec
 */
function x(name, prec) {
  return new TokenType(name, { binop: prec })
}

Expected behavior:

TokenType's inferred type should be (label: string, conf: { binop: string }) based on usage in x.

Actual behavior:
TokenType's inferred type is (label: any, conf: { binop: null }), based only on usage inside TokenType itself.

I don't think infer-from-usage supports any JS assignment patterns; this is just the first one I ran into.

Start with the acorn example in the issue and trace the infer-from-usage handling for the TokenType constructor and the x function. Verify how assignment patterns and references of related tokens are collected; done means the inferred type includes label: string and conf: { binop: string } rather than any and null.