Fix compilation with Nim 1.2.6

.tool-versions

@@ -1 +1 @@
-nim 1.4.2
+nim 1.4.4

nim.cfg

@@ -0,0 +1 @@
+--warning[ObservableStores]:"off"

nitro/abi.nim

@@ -2,6 +2,8 @@ import pkg/stew/endians2
 import pkg/stint
 import ./types
 
+include ./noerrors
+
 type
   AbiEncoder* = object
     stack: seq[Tuple]
@@ -13,8 +15,6 @@ type
     head: Slice[int]
     tail: seq[byte]
 
-{.push raises:[].}
-
 proc write*[T](encoder: var AbiEncoder, value: T)
 proc encode*[T](_: type AbiEncoder, value: T): seq[byte]
 

nitro/channel.nim

@@ -2,6 +2,8 @@ import pkg/nimcrypto
 import ./abi
 import ./types
 
+include ./noerrors
+
 export types
 
 type
@@ -10,8 +12,6 @@ type
     participants*: seq[EthAddress]
     chainId*: UInt256
 
-{.push raises:[].}
-
 proc getChannelId*(channel: Channel): array[32, byte] =
   var encoder= AbiEncoder.init()
   encoder.startTuple()

nitro/helpers.nim

@@ -1,13 +1,13 @@
 import std/options
 import pkg/stew/results
 
+include ./noerrors
+
 export options
 export results
 
-{.push raises:[].}
-
 proc toOption*[T, E](res: Result[T, E]): Option[T] =
   if res.isOk:
-    res.value.some
+    res.unsafeGet().some
   else:
     T.none

nitro/noerrors.nim

@@ -0,0 +1,8 @@
+## Include this file to indicate that your module does not raise Errors.
+## Disables compiler hints about unused declarations in Nim < 1.4.0
+
+when (NimMajor, NimMinor, NimPatch) >= (1, 4, 0):
+  {.push raises:[].}
+else:
+  {.push raises: [Defect].}
+  {.hint[XDeclaredButNotUsed]: off.}

nitro/outcome.nim

@@ -2,6 +2,8 @@ import pkg/nimcrypto
 import ./abi
 import ./types
 
+include ./noerrors
+
 export types
 export abi
 
@@ -25,8 +27,6 @@ type
     targetChannelId*: array[32, byte]
     destinations*: seq[array[32, byte]]
 
-{.push raises:[].}
-
 proc encode*(encoder: var AbiEncoder, guarantee: Guarantee) =
   encoder.startTuple()
   encoder.startTuple()

nitro/signature.nim

@@ -5,6 +5,8 @@ import pkg/stew/byteutils
 import ./state
 import ./helpers
 
+include ./noerrors
+
 export options
 export toPublicKey
 
@@ -13,8 +15,6 @@ type
   PublicKey* = SkPublicKey
   Signature* = SkRecoverableSignature
 
-{.push raises:[].}
-
 proc rng(data: var openArray[byte]): bool =
   randomBytes(data) == data.len
 

nitro/state.nim

@@ -4,6 +4,8 @@ import ./channel
 import ./outcome
 import ./abi
 
+include ./noerrors
+
 export types
 export channel
 export outcome
@@ -27,8 +29,6 @@ type
     outcome*: seq[byte]
     appdata*: seq[byte]
 
-{.push raises:[].}
-
 proc fixedPart*(state: State): FixedPart =
   FixedPart(
     chainId: state.channel.chainId,

nitro/types.nim

@@ -3,6 +3,8 @@ import std/options
 import pkg/stint
 import pkg/stew/byteutils
 
+include ./noerrors
+
 export stint
 export options
 
@@ -10,8 +12,6 @@ type
   UInt48* = range[0'u64..2'u64^48-1]
   EthAddress* = distinct array[20, byte]
 
-{.push raises:[].}
-
 proc toArray*(address: EthAddress): array[20, byte] =
   array[20, byte](address)