text/template: :=, =, !, %, etc all assign to variables #3271

rsc · 2012-03-10T05:59:12Z

http://play.golang.org/p/uxtQRPpcd9

        {{$x:=0}}{{$x}}
        {{$x=1}}{{$x}}
        {{$x!2}}{{$x}}
        {{$x%3}}{{$x}}

prints

        0
        1
        2
        3

rsc · 2012-03-10T20:13:07Z

Comment 1:

Changing to Go1-Must to avoid breaking Go 1 programs later.
The fix should disallow = for assignment, even though it is used (probably accidentally)
in one test.  A simple, useful future addition would be to have = for reassigning
existing variables, so it is important that = not be equivalent to := now.
This is the test that will need changing:
    {"variable declared by template", `{{template "nested" $x=.SI}},{{index $x 1}}`, "[3 4 5],4", tVal, true},

Labels changed: added go1-must.

robpike · 2012-03-13T20:03:25Z

Comment 2:

This issue was closed by revision 8170d81.

Status changed to Fixed.

rsc added fixed labels Mar 13, 2012

rsc added this to the Go1 milestone Apr 10, 2015

rsc removed priority-go1 labels Apr 10, 2015

golang locked and limited conversation to collaborators Jun 24, 2016

gopherbot added the FrozenDueToAge label Jun 24, 2016

This issue was closed.

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text/template: :=, =, !, %, etc all assign to variables #3271

text/template: :=, =, !, %, etc all assign to variables #3271

rsc commented Mar 10, 2012

rsc commented Mar 10, 2012

robpike commented Mar 13, 2012

text/template: :=, =, !, %, etc all assign to variables #3271

text/template: :=, =, !, %, etc all assign to variables #3271

Comments

rsc commented Mar 10, 2012

rsc commented Mar 10, 2012

robpike commented Mar 13, 2012