Allow conditional type in callable return type

[rvanvelzen]

Fix #151

[ondrejmirtes]

Every parser change now has implications for the Printer.

This change now means that the return type can contain NullableTypeNode which has to be parenthesized.

This change should be tested by trying to print CallableTypeNode with NullableTypeNode in the return type. The change needs to happen here:

phpdoc-parser/src/Printer/Printer.php

Line 368 in 9f854d2

if ($node->returnType instanceof CallableTypeNode || $node->returnType instanceof UnionTypeNode || $node->returnType instanceof IntersectionTypeNode) {

Also the format-preserving printer needs an addition in Printer::$parenthesesMap:

phpdoc-parser/src/Printer/Printer.php

Lines 122 to 126 in 9f854d2

	CallableTypeNode::class . '->returnType' => [
	CallableTypeNode::class,
	UnionTypeNode::class,
	IntersectionTypeNode::class,
	],

[rvanvelzen]

Nullable types were already accepted, and do not need to be parenthesized. The only change is that conditional types are now accepted.

[ondrejmirtes]

Oh right, I didn't realize that.

[ondrejmirtes]

Thank you!