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Dridi Boukelmoune authored
After the initial discussion from #3163, and looking more closely at how variable access is handled in subroutines I noticed a discrepancy. Setting a read only variable like obj.ttl in vcl_recv would result in a misleading error message explaining that it is read only, instead of simply not available. This change defers the illegal write check, registering unconditionally that the symbol was used in a set action. As a result we always get the correct error message but depending on whether this is happening in a vcl_ or custom subroutine we may either get "in subroutine" or "from subroutine" in the error message. A minor discrepancy probably worth getting rid of the prior inconsistency. This is covered by the v21 test case.
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