dlesnoff
commented
1 year ago Before nim 1.4.0 (not sure of the exact version), the operator was .. and < was a template symbol for the substraction by 1.
This is true for all listings in Nim in Action and most of ancient Nim code.
The below sequence code on Page 42 is not able to compile in nim 2.0:
let list = @[4, 8, 15, 16, 23, 42] for i in 0 .. <list.len: stdout.write($list[i] & " ")
Encountered the following error: D:\nimTest\seqTest.nim(2, 15) Error: type mismatch Expression: <=len(list) [1] len(list): int
Expected one of (first mismatch at [position]): [1] proc
<=(x, y: bool): bool [1] proc<=(x, y: char): bool [1] proc<=(x, y: float): bool [1] proc<=(x, y: float32): bool [1] proc<=(x, y: int16): bool [1] proc<=(x, y: int32): bool [1] proc<=(x, y: int8): bool [1] proc<=(x, y: pointer): bool [1] proc<=(x, y: string): bool [1] proc<=(x, y: uint): bool [1] proc<=(x, y: uint16): bool [1] proc<=(x, y: uint32): bool [1] proc<=(x, y: uint64): bool [1] proc<=(x, y: uint8): bool [1] proc<=[Enum: enum](x, y: Enum): bool [1] proc<=[T: tuple](x, y: T): bool [1] proc<=[T](x, y: ref T): bool [1] proc<=[T](x, y: set[T]): bool [2] proc<=(x, y: int): bool [2] proc<=(x, y: int64): bool========================
However, removing the space after the '..' fix the issue.
let list = @[4, 8, 15, 16, 23, 42] for i in 0 ..< list.len: stdout.write($list[i] & " ")