Stack overflow on macOS with a big source-file

[njlr]

Note: I am unable to reproduce this issue in the online tool, or indeed on Linux.

Running a check format on this source-file causes a stack overflow on macOS, but not on Linux.

The full error message can be seen here: https://github.com/njlr/bazel-fantomas/runs/8233614713?check_suite_focus=true

On Linux the formatting check passes (as expected).

The version of Fantomas is 5.0.0-beta-009

[nojaf]

Hello,

It appears

fantomas/src/Fantomas.Core/SourceParser.fs

Lines 611 to 615 in 0981dfe

	let rec (|Sequentials|_|) =
	function
	| Sequential (e, Sequentials es, _) -> Some(e :: es)
	| Sequential (e1, e2, _) -> Some [ e1; e2 ]
	| _ -> None

is not tail recursive.

I would accept a PR if you can make it so.

[njlr]

Here we go: #2495

I actually went with an imperative solution for easier optimization - F# has no [<RequireTailCallOptimization>] attribute AFAIK.

[njlr]

Fixed in 5.0.0-beta-010