interp: fix type switch on arbitrary expressions #1445
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mpl
approved these changes
Aug 25, 2022
If the value on which to type-switch was already set (i.e. a variable), there was no problem. But if it had to be obtained through a complex expression (func call, array index, etc...), then the code to retrieve the value prior type-switch was not scheduled. This is now fixed. The issue it fixes is nasty because the behavior was silently changed, leading to further unrelated issues or panics. Fixes traefik#1444.
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If the value on which to type-switch was already set (i.e. a variable),
there was no problem. But if it had to be obtained through a complex
expression (func call, array index, etc...), then the code to retrieve
the value prior type-switch was not scheduled. This is now fixed.
This issue is nasty because the behavior is silently changed,
leading potentially to further unrelated issues or runtime panics.
Fixes #1444.