Fix build for go < 1.18

flag_float64_slice.go

@@ -164,21 +164,6 @@ func (f *Float64SliceFlag) Apply(set *flag.FlagSet) error {
 	return nil
 }
 
-func (f *Float64SliceFlag) SetValue(slice []float64) {
-	f.Value = newSliceFlagValue(NewFloat64Slice, slice)
-}
-
-func (f *Float64SliceFlag) SetDestination(slice []float64) {
-	f.Destination = newSliceFlagValue(NewFloat64Slice, slice)
-}
-
-func (f *Float64SliceFlag) GetDestination() []float64 {
-	if destination := f.Destination; destination != nil {
-		return destination.Value()
-	}
-	return nil
-}
-
 // Get returns the flag’s value in the given Context.
 func (f *Float64SliceFlag) Get(ctx *Context) []float64 {
 	return ctx.Float64Slice(f.Name)

flag_int64_slice.go

@@ -163,21 +163,6 @@ func (f *Int64SliceFlag) Apply(set *flag.FlagSet) error {
 	return nil
 }
 
-func (f *Int64SliceFlag) SetValue(slice []int64) {
-	f.Value = newSliceFlagValue(NewInt64Slice, slice)
-}
-
-func (f *Int64SliceFlag) SetDestination(slice []int64) {
-	f.Destination = newSliceFlagValue(NewInt64Slice, slice)
-}
-
-func (f *Int64SliceFlag) GetDestination() []int64 {
-	if destination := f.Destination; destination != nil {
-		return destination.Value()
-	}
-	return nil
-}
-
 // Get returns the flag’s value in the given Context.
 func (f *Int64SliceFlag) Get(ctx *Context) []int64 {
 	return ctx.Int64Slice(f.Name)

flag_int_slice.go

@@ -174,21 +174,6 @@ func (f *IntSliceFlag) Apply(set *flag.FlagSet) error {
 	return nil
 }
 
-func (f *IntSliceFlag) SetValue(slice []int) {
-	f.Value = newSliceFlagValue(NewIntSlice, slice)
-}
-
-func (f *IntSliceFlag) SetDestination(slice []int) {
-	f.Destination = newSliceFlagValue(NewIntSlice, slice)
-}
-
-func (f *IntSliceFlag) GetDestination() []int {
-	if destination := f.Destination; destination != nil {
-		return destination.Value()
-	}
-	return nil
-}
-
 // Get returns the flag’s value in the given Context.
 func (f *IntSliceFlag) Get(ctx *Context) []int {
 	return ctx.IntSlice(f.Name)

flag_string_slice.go

@@ -152,21 +152,6 @@ func (f *StringSliceFlag) Apply(set *flag.FlagSet) error {
 	return nil
 }
 
-func (f *StringSliceFlag) SetValue(slice []string) {
-	f.Value = newSliceFlagValue(NewStringSlice, slice)
-}
-
-func (f *StringSliceFlag) SetDestination(slice []string) {
-	f.Destination = newSliceFlagValue(NewStringSlice, slice)
-}
-
-func (f *StringSliceFlag) GetDestination() []string {
-	if destination := f.Destination; destination != nil {
-		return destination.Value()
-	}
-	return nil
-}
-
 // Get returns the flag’s value in the given Context.
 func (f *StringSliceFlag) Get(ctx *Context) []string {
 	return ctx.StringSlice(f.Name)

sliceflag.go

@@ -1,3 +1,6 @@
+//go:build go1.18
+// +build go1.18
+
 package cli
 
 import (
@@ -226,3 +229,65 @@ func unwrapFlagValue(v flag.Value) flag.Value {
 		v = h.value
 	}
 }
+
+// NOTE: the methods below are in this file to make use of the build constraint
+
+func (f *Float64SliceFlag) SetValue(slice []float64) {
+	f.Value = newSliceFlagValue(NewFloat64Slice, slice)
+}
+
+func (f *Float64SliceFlag) SetDestination(slice []float64) {
+	f.Destination = newSliceFlagValue(NewFloat64Slice, slice)
+}
+
+func (f *Float64SliceFlag) GetDestination() []float64 {
+	if destination := f.Destination; destination != nil {
+		return destination.Value()
+	}
+	return nil
+}
+
+func (f *Int64SliceFlag) SetValue(slice []int64) {
+	f.Value = newSliceFlagValue(NewInt64Slice, slice)
+}
+
+func (f *Int64SliceFlag) SetDestination(slice []int64) {
+	f.Destination = newSliceFlagValue(NewInt64Slice, slice)
+}
+
+func (f *Int64SliceFlag) GetDestination() []int64 {
+	if destination := f.Destination; destination != nil {
+		return destination.Value()
+	}
+	return nil
+}
+
+func (f *IntSliceFlag) SetValue(slice []int) {
+	f.Value = newSliceFlagValue(NewIntSlice, slice)
+}
+
+func (f *IntSliceFlag) SetDestination(slice []int) {
+	f.Destination = newSliceFlagValue(NewIntSlice, slice)
+}
+
+func (f *IntSliceFlag) GetDestination() []int {
+	if destination := f.Destination; destination != nil {
+		return destination.Value()
+	}
+	return nil
+}
+
+func (f *StringSliceFlag) SetValue(slice []string) {
+	f.Value = newSliceFlagValue(NewStringSlice, slice)
+}
+
+func (f *StringSliceFlag) SetDestination(slice []string) {
+	f.Destination = newSliceFlagValue(NewStringSlice, slice)
+}
+
+func (f *StringSliceFlag) GetDestination() []string {
+	if destination := f.Destination; destination != nil {
+		return destination.Value()
+	}
+	return nil
+}

sliceflag_pre18.go

@@ -0,0 +1,10 @@
+//go:build !go1.18
+// +build !go1.18
+
+package cli
+
+import (
+	"flag"
+)
+
+func unwrapFlagValue(v flag.Value) flag.Value { return v }

sliceflag_test.go

@@ -1,3 +1,6 @@
+//go:build go1.18
+// +build go1.18
+
 package cli
 
 import (