diff options
| -rw-r--r-- | compiler/semexprs.nim | 2 | ||||
| -rw-r--r-- | lib/system.nim | 8 | ||||
| -rw-r--r-- | tests/array/tarray.nim | 7 |
3 files changed, 17 insertions, 0 deletions
diff --git a/compiler/semexprs.nim b/compiler/semexprs.nim index cbd4318f7..13b53ef32 100644 --- a/compiler/semexprs.nim +++ b/compiler/semexprs.nim @@ -379,6 +379,8 @@ proc semLowHigh(c: PContext, n: PNode, m: TMagic): PNode = n.typ = getSysType(c.graph, n.info, tyInt) of tyArray: n.typ = typ[0] # indextype + if n.typ.kind == tyRange and emptyRange(n.typ.n[0], n.typ.n[1]): #Invalid range + n.typ = getSysType(c.graph, n.info, tyInt) of tyInt..tyInt64, tyChar, tyBool, tyEnum, tyUInt..tyUInt64, tyFloat..tyFloat64: n.typ = n[1].typ.skipTypes({tyTypeDesc}) of tyGenericParam: diff --git a/lib/system.nim b/lib/system.nim index 6e84aca66..38f6d64d3 100644 --- a/lib/system.nim +++ b/lib/system.nim @@ -348,6 +348,8 @@ proc high*[T](x: openArray[T]): int {.magic: "High", noSideEffect.} proc high*[I, T](x: array[I, T]): I {.magic: "High", noSideEffect.} ## Returns the highest possible index of an array `x`. ## + ## For empty arrays, the return type is `int`. + ## ## See also: ## * `low(array) <#low,array[I,T]>`_ ## @@ -360,6 +362,8 @@ proc high*[I, T](x: array[I, T]): I {.magic: "High", noSideEffect.} proc high*[I, T](x: typedesc[array[I, T]]): I {.magic: "High", noSideEffect.} ## Returns the highest possible index of an array type. ## + ## For empty arrays, the return type is `int`. + ## ## See also: ## * `low(typedesc[array]) <#low,typedesc[array[I,T]]>`_ ## @@ -420,6 +424,8 @@ proc low*[T](x: openArray[T]): int {.magic: "Low", noSideEffect.} proc low*[I, T](x: array[I, T]): I {.magic: "Low", noSideEffect.} ## Returns the lowest possible index of an array `x`. ## + ## For empty arrays, the return type is `int`. + ## ## See also: ## * `high(array) <#high,array[I,T]>`_ ## @@ -432,6 +438,8 @@ proc low*[I, T](x: array[I, T]): I {.magic: "Low", noSideEffect.} proc low*[I, T](x: typedesc[array[I, T]]): I {.magic: "Low", noSideEffect.} ## Returns the lowest possible index of an array type. ## + ## For empty arrays, the return type is `int`. + ## ## See also: ## * `high(typedesc[array]) <#high,typedesc[array[I,T]]>`_ ## diff --git a/tests/array/tarray.nim b/tests/array/tarray.nim index 81a43f203..2765ad06d 100644 --- a/tests/array/tarray.nim +++ b/tests/array/tarray.nim @@ -587,3 +587,10 @@ block t12466: a[0'u16 + i] = i for i in 0'u16 ..< 8'u16: a[0'u16 + i] = i + +block t17705: + # https://github.com/nim-lang/Nim/pull/17705 + var a = array[0, int].low + a = int(a) + var b = array[0, int].high + b = int(b) |