Follow fix for method call with in bug

[eileencodes]

This PR is a followup to #3558 and fixes the following cases, which should throw a syntax error but were not:

A.print message: in 'BAR'

A.print message:
in 'BAR'

To fix this we check for methods calls with arguments and no parens that then call in.

Note I had claude write this because I wasn't sure where the problem was but then edited it to remove extra unnecessary code the robot wrote.

cc/ @tenderlove @kddnewton

[tenderlove]

I need @kddnewton's opinion here, but I feel like testing for a specific token isn't the right fix and that we should be using binding power instead (but this is just a gut feeling). Is in the only keyword that has a problem?

[tompng]

Is in the only keyword that has a problem?

Looks like in, =>, ., &. and all binary operators except + - ** & * are wrongly accepted after A.print message: but not after a.print message:

[tompng]

And ternary operator A.print message: ? 1 : 2

[Earlopain]

I agree with @tenderlove that this is not the correct fix. The code that is supposed to handle this is here:

prism/src/prism.c

Lines 22253 to 22261 in ce4abe1

	case PM_CALL_NODE:
	// If we have a call node, then we need to check if it looks like a
	// method call without parentheses that contains arguments. If it
	// does, then it has different rules for parsing infix operators,
	// namely that it only accepts composition (and/or) and modifiers
	// (if/unless/etc.).
	if ((pm_binding_powers[parser->current.type].left > PM_BINDING_POWER_COMPOSITION) && pm_call_node_command_p((pm_call_node_t *) node)) {
	return node;
	}

But parse_expression_prefix returns PM_CONSTANT_READ_NODE. So I feel like the fix would be to modify parse_expression_prefix so that it parses further instead of just one node deep. Or this check is also needed at some other place.

But I did not manage to actually fix it myself last I looked into this.