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lang/funcs: type conversion functions can convert null values #30879

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merged 1 commit into from Apr 20, 2022
Merged

lang/funcs: type conversion functions can convert null values #30879

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7 changes: 4 additions & 3 deletions internal/lang/funcs/conversion.go
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Expand Up @@ -30,9 +30,10 @@ func MakeToFunc(wantTy cty.Type) function.Function {
// messages to be more appropriate for an explicit type
// conversion, whereas the cty function system produces
// messages aimed at _implicit_ type conversions.
Type: cty.DynamicPseudoType,
AllowNull: true,
AllowMarked: true,
Type: cty.DynamicPseudoType,
AllowNull: true,
AllowMarked: true,
AllowDynamicType: true,
},
},
Type: func(args []cty.Value) (cty.Type, error) {
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10 changes: 10 additions & 0 deletions internal/lang/funcs/conversion_test.go
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Expand Up @@ -33,6 +33,16 @@ func TestTo(t *testing.T) {
cty.NullVal(cty.String),
``,
},
{
// This test case represents evaluating the expression tostring(null)
// from HCL, since null in HCL is cty.NullVal(cty.DynamicPseudoType).
// The result in that case should still be null, but a null specifically
// of type string.
cty.NullVal(cty.DynamicPseudoType),
cty.String,
cty.NullVal(cty.String),
``,
},
{
cty.StringVal("a").Mark("boop"),
cty.String,
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