ref: bbe28faab4f6dce29fe820450c425d255546cfbb
dir: /test/asm/syntax-error-lexer-mode.asm/
newline equs "\n"
def x = 1 newline def y = 2
println "x={d:x}, y={d:y}"
; the lexer is already in normal mode at the `AF`, so `newline` gets expanded
def m = AF newline def n = 2
println "n={d:n}"
; the lexer is in raw mode at the `AF`, but the parser resets it to normal
def AF = 1 newline def q = 2
println "q={d:q}"