hasUserDefinedOperators - language feature

Example from HOPE:

Hope enables us to use a function with two arguments as an infix operator. e must assign it a priority and use it as an infix operator everywhere, including the equations that define it. A bigger number in the infix declaration means a higher priority. Most of Hope's standard functions are supplied as infix operators.
infix mult 8;
dec mult : num # num - > num;
---xmulty<= ifY=0then0elsexmult(y-1)+x;

Example from Speedie:

class myclass
 |int| Num
 operator add (|int| x, |myclass|)
  return myclass(.num + x)
 render
  fs <~ .num

main
 || x = myclass(1)
 || y = myclass(2)
 || z = y + x
 printline z

Languages with hasUserDefinedOperators include HOPE, Speedie

Languages without hasUserDefinedOperators include C3, Jule

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