Fix panic with substr interpolation function by invalid offset
Fixes #17041
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@ -1577,7 +1577,7 @@ func interpolationFuncSubstr() ast.Function {
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return nil, fmt.Errorf("length should be a non-negative integer")
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}
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if offset > len(str) {
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if offset > len(str) || offset < 0 {
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return nil, fmt.Errorf("offset cannot be larger than the length of the string")
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}
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@ -2568,6 +2568,11 @@ func TestInterpolateFuncSubstr(t *testing.T) {
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nil,
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true,
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},
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{
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`${substr("foo", -4, -1)}`,
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nil,
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true,
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},
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// invalid length
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{
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