tree 9f5395a39da32e095bc3a3d828bc434edb3966d3
parent 107ebb178176f00c988a40943446af6f672b1e63
author Daniel Martí <mvdan@mvdan.cc> 1569345250 +0100
committer Daniel Martí <mvdan@mvdan.cc> 1590706133 +0000

encoding/xml: only initialize nil struct fields when decoding

fieldInfo.value used to initialize nil anonymous struct fields if they
were encountered. This behavior is wanted when decoding, but not when
encoding. When encoding, the value should never be modified, and these
nil fields should be skipped entirely.

To fix the bug, add a bool argument to the function which tells the
code whether we are encoding or decoding.

Finally, add a couple of tests to cover the edge cases pointed out in
the original issue.

Fixes #27240.

Change-Id: Ic97ae4bfe5f2062c8518e03d1dec07c3875e18f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/196809
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>