[Trivia] Line comment after then breaks code

[jindraivanek]

Issue created from fantomas-ui

Line comment after then breaks code. Regression from stable/master.

Code

if true then //comment
    1
else 0

Error

if true //comment then 1
else 0

Options

Fantomas Next - 3.0.0-7/20/2019

Name	Value
IndentSpaceNum	4
PageWidth	120
PreserveEndOfLine	false
SemicolonAtEndOfLine	false
SpaceBeforeArgument	true
SpaceBeforeColon	false
SpaceAfterComma	true
SpaceAfterSemicolon	true
IndentOnTryWith	false
ReorderOpenDeclaration	false
SpaceAroundDelimiter	true
StrictMode	false