The infinite loop was caused in src/parser/quote_expression.pir as
follows: the call to the rule on line 288 returns failure (since '$'
is not a valid variable); quote_literal is called instead, but
concludes on line 360 that it's reached an escape char ('$'), and
exits immediately. The control is passed back and forth like this,
never advancing pos.Two possible patches for this issue attached.
dollar_bug.patch1
Description: Binary data
dollar_bug.patch2
Description: Binary data
