fix: handle slice literals without named types

[a-h]

Fixes #626

[joerdav]

This all makes complete sense, though I have some test cases that might require some minor changes. Quite niche scenarios too.

{
	name: "function call with array of explicit length",
	input: `tabs([2]TabData{
  {Name: "A"},
  {Name: "B"},
})`,
},
{
	name: "function call with array of inferred length",
	input: `tabs([...]TabData{
  {Name: "A"},
  {Name: "B"},
})`,
},

[joerdav]

Oh! I expected that to fail because of:

if ep.Previous == token.LBRACK && tok == token.RBRACK {

Maybe I need to read the PR again...

[a-h]

Those additional cases don't appear to require any changes, because it's hitting the logic that if there's an open [, anything until the next ] is OK.

[joerdav]

Cool, racked my brain and can't think of any more scenarios. Re-read the code with a fresh brain, and it all makes sense now.

[a-h]

Thanks for thinking about it, that's half the battle. :)