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Merge pull request #2280 from nspcc-dev/compiler-struct-cast

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compiler: allow to slice struct field
This commit is contained in:
Roman Khimov 2021-11-30 18:14:56 +03:00 committed by GitHub
commit dbe184a335
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2 changed files with 13 additions and 3 deletions
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6
pkg/compiler/codegen.go
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@ -644,12 +644,12 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
return nil
case *ast.SliceExpr:
if isCompoundSlice(c.typeOf(n.X.(*ast.Ident)).Underlying()) {
if isCompoundSlice(c.typeOf(n.X).Underlying()) {
c.prog.Err = errors.New("subslices are supported only for []byte")
return nil
}
name := n.X.(*ast.Ident).Name
c.emitLoadVar("", name)
ast.Walk(c, n.X)
if n.Low != nil {
ast.Walk(c, n.Low)

10
pkg/compiler/slice_test.go
View file

@ -432,6 +432,16 @@ func TestSubsliceCompound(t *testing.T) {
require.Error(t, err)
}
func TestSubsliceFromStructField(t *testing.T) {
src := `package foo
type pair struct { key, value []byte }
func Main() []byte {
p := pair{ []byte{1}, []byte{4, 8, 15, 16, 23, 42} }
return p.value[2:4]
}`
eval(t, src, []byte{15, 16})
}
func TestRemove(t *testing.T) {
t.Run("Valid", func(t *testing.T) {
src := `package foo