Issue Description:

These have never once worked, so we ought to do a better job of detecting and diagnosing them. Right now operator folding kicks in and we just get a cascade of bad errors

import func SwiftUI.Text.== 
// Consecutive statements on a line must be separated by ';'
// Operator with postfix spacing cannot start a subexpression
// Expected expression
// 'Text' was imported as 'func', but it is a struct
//  Operator with postfix spacing cannot start a subexpression

Right after we call parseAnyIdentifier in parseImportDecl would be the right place to check, diagnose, and delete these operator components.