Tests separating Julia's commands from output in REPL-like code blocks

---input---
julia> f(x) = sin(π/2x)
f (generic function with 1 method)

julia> @. f(1:2)
2-element Vector{Float64}:
 1.0
 0.7071067811865475

---tokens---
'julia>'      Generic.Prompt
' '           Text.Whitespace
'f'           Name
'('           Punctuation
'x'           Name
')'           Punctuation
' '           Text.Whitespace
'='           Operator
' '           Text.Whitespace
'sin'         Name
'('           Punctuation
'π'           Name.Builtin
'/'           Operator
'2'           Literal.Number.Integer
'x'           Name
')'           Punctuation
'\n'          Text.Whitespace

'f (generic function with 1 method)\n' Generic.Output

'\n'          Generic.Output

'julia>'      Generic.Prompt
' '           Text.Whitespace
'@.'          Name.Decorator
' '           Text.Whitespace
'f'           Name
'('           Punctuation
'1'           Literal.Number.Integer
':'           Operator
'2'           Literal.Number.Integer
')'           Punctuation
'\n'          Text.Whitespace

'2-element Vector{Float64}:\n' Generic.Output

' 1.0\n'      Generic.Output

' 0.7071067811865475\n' Generic.Output