Version 2.20 Variable Default Assignment Problem

Dim temp1 As String ="hello" & "," & "hello"

Compiling code. Error
Error parsing program.
Error description: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
Occurred on line: 1267
Dim temp2 As String ="hello" & "," & "hello"

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Dim temp1 As String ="hello" & ", " & "hello"

Dim v1, v2 As Int = 0

Dim temp1 As String = "test(" & v1 & "," & v2  & ")"

Compiling code. Error
Error parsing program.
Error description: Unknown type: &
Are you missing a library reference?
Occurred on line: 1267
Dim temp1 As String = "test(" & v1 & "," & v2 & ")"

Click to expand...

Dim temp1 As String = "test(" & v1 & ", " & v2  & ")"

Dim temp1 As String  : temp1 = "test(" & v1 & "," & v2  & ")"