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compiler: allow to use _ in constants

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When `_` is unused it can be omitted from constant values mapping.
Catched when compiling `netmap` contract from nspcc-dev/neofs-contract.

Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>
This commit is contained in:
Evgeniy Stratonikov 2022-01-18 11:46:48 +03:00
parent 945b56e350
commit 970769e5b2
2 changed files with 17 additions and 3 deletions
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8
pkg/compiler/codegen.go
View file

@ -555,9 +555,11 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
vs := spec.(*ast.ValueSpec)
for i := range vs.Names {
obj := c.currPkg.Types.Scope().Lookup(vs.Names[i].Name)
c.constMap[c.getIdentName("", vs.Names[i].Name)] = types.TypeAndValue{
Type: obj.Type(),
Value: obj.(*types.Const).Val(),
if obj != nil { // can be nil if unused
c.constMap[c.getIdentName("", vs.Names[i].Name)] = types.TypeAndValue{
Type: obj.Type(),
Value: obj.(*types.Const).Val(),
}
}
}
}

12
pkg/compiler/global_test.go
View file

@ -12,6 +12,18 @@ import (
"github.com/stretchr/testify/require"
)
func TestUnusedGlobal(t *testing.T) {
src := `package foo
const (
_ int = iota
a
)
func Main() int {
return 1
}`
eval(t, src, big.NewInt(1))
}
func TestChangeGlobal(t *testing.T) {
src := `package foo
var a int