text/template: fix truth handling of typed interface nils in if and with
Before this commit, the two logically equivalent conditionals below would produce different output: {{ if not .NonEmptyInterfaceTypedNil }}OK{{ else }}{{ end }} {{ if .NonEmptyInterfaceTypedNil }}{{ else }}OK{{ end }} The functions `not`, `or`, and `and` all use the same `truth` function, which unwraps any concrete interface value before passing it to `isTrue`. `if` and `with` also use `isTrue` to establish truth, but was missing the interface indirect call. Fixes #30501 Change-Id: I9c49eed41e737d8f162e39bef1c3b82fd5518fed GitHub-Last-Rev: 95fc2c82f26d24a457de4deaa7e5756718fbf07c GitHub-Pull-Request: golang/go#30534 Reviewed-on: https://go-review.googlesource.com/c/go/+/164958Reviewed-by: Russ Cox <rsc@golang.org> Run-TryBot: Russ Cox <rsc@golang.org>
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