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I thought this is from ML and related functional languages? (i.e. this is just the way they've always done it)

• int_19h 8y ago
  It's from Pascal; at least I can't think of any earlier language that had it. It's very noticeable when you compare it to ALGOL W, which Wirth did just before Pascal.
  • erk__ 8y ago
    ML came out around the same time, though I don't know why they chose to have the type on the right there.