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Crash on switch statement while editing previous scope (SIGSEGV) #411

Description

@MightyPrinny

I was writting something like this and I found that it always crashes after modifying the part before the switch

enum MyEnum {
   First,
   Second,
   Third
}

struct MyThing {
   int x;
   MyEnum thing;
}

void thing() {
   MyThing thing;
   MyThing thing2;
   MyThing thing3;
   MyThing[] things = [thing, thing2, thing3];

   foreach (const ref MyThing t; things) {
      switch (t.thing) {
      case MyEnum.First:
         break;
      case MyEnum.Second:
         break;
      default:
         break;
      }

   }

}

For example it crashes after adding something like:

int i
 switch (t.thing) {
      case MyEnum.First:
...

This causes a segfault in libc.

I saw this in the log before the crash:

Expected `;` instead of `switch`\n"

I tested with master and the latest beta, I'm using it in Neovim

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