AstGen: pass more compile error tests

* Implement "initializing array with struct syntax"
 * Implement "'_' used as an identifier without @\"_\" syntax"
 * Fix source location of "missing parameter name"
 * Update test cases where appropriate
abfee12735Andrew Kelley committed on 7/2/2021, 8:27:35 PMparent24c4326
2 files changedLine totals unavailable