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###############################
#### part from Arraymancer
type
MetadataArray* = object
data*: array[8, int]
len*: int
# Commenting the converter removes the error "lib/system.nim(3536, 3) Error: for a 'var' type a variable needs to be passed"
converter toMetadataArray*(se: varargs[int]): MetadataArray {.inline.} =
result.len = se.len
for i in 0..<se.len:
result.data[i] = se[i]
when NimVersion >= "0.17.3":
type Index = int or BackwardsIndex
template `^^`(s, i: untyped): untyped =
when i is BackwardsIndex:
s.len - int(i)
else: i
else:
type Index = int
template `^^`(s, i: untyped): untyped =
i
## With Nim devel from the start of the week (~Oct30) I managed to trigger "lib/system.nim(3536, 4) Error: expression has no address"
## but I can't anymore after updating Nim (Nov5)
## Now commenting this plain compiles and removes the error "lib/system.nim(3536, 3) Error: for a 'var' type a variable needs to be passed"
proc `[]`*(a: var MetadataArray, idx: Index): var int {.inline.} =
a.data[a ^^ idx]
##############################
### Completely unrelated lib that triggers the issue
type
MySeq[T] = ref object
data: seq[T]
proc test[T](sx: MySeq[T]) =
# Removing the backward index removes the error "lib/system.nim(3536, 3) Error: for a 'var' type a variable needs to be passed"
echo sx.data[^1] # error here
let s = MySeq[int](data: @[1, 2, 3])
s.test()
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