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encoding/json: UnmarshalText confuses json.Unmarshal #8462

kortschak opened this issue Aug 2, 2014 · 2 comments

encoding/json: UnmarshalText confuses json.Unmarshal #8462

kortschak opened this issue Aug 2, 2014 · 2 comments


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What does 'go version' print?
go version go1.3 linux/amd64
go version devel +f7e7857afd88 Fri Aug 01 16:45:33 2014 -0700 linux/amd64

What steps reproduce the problem?
If possible, include a link to a program on

1. Run the program at
2. Run the program at

What happened?
The first program prints a reasonably unhelpful error "error: JSON decoder out of
sync - data changing underfoot?" and the second program prints the expected result.

What should have happened instead?
Both programs should behave as the second, a more informative error should be printed,
or the json documentation should warn about use of encoding.TextUnmarshaler.
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Comment 1:

Labels changed: added repo-main, release-none.

@bradfitz bradfitz removed the new label Dec 18, 2014
@rsc rsc added this to the Unplanned milestone Apr 10, 2015
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rsc commented Jul 15, 2015

Dup of #9650.

@rsc rsc closed this as completed Jul 15, 2015
@golang golang locked and limited conversation to collaborators Jul 18, 2016
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