f=x=>(y => x + y)
// evaluates to
x=>y=>{x+y}
// doesn't reparse
15:33:49.421 r1 [ERR] Error loading autoload line "f=x=>y=>{x+y}": parsing error: [1: lambda parameters must be identifiers, not =>
f=x=>y=>{x+y}
^ 1: expected next token to be `:`, got `}` instead:
f=x=>y=>{x+y}
^]
in general
x=>y=>z=>(x+y+z)should work