parse failed: template: unexpected "=" in operand

[zhcppy]

partials/work.html
...
11 {{ $categories := slice }}
12 {{ range .Site.Data.work.portfolio }}
13 {{ $categories = $categories | append .category }}
14 {{ end }}
...

error info
parse failed: template: partials/work.html:13: unexpected "=" in operand

env
➜ goblog git:(master) ✗ go version
go version go1.10.3 darwin/amd64
➜ goblog git:(master) ✗ hugo version
Hugo Static Site Generator v0.54-DEV darwin/amd64 BuildDate: unknown
➜ goblog git:(master) ✗ uname -a
Darwin zhcppy.local 17.7.0 Darwin Kernel Version 17.7.0: Thu Jun 21 22:53:14 PDT 2018; root:xnu-4570.71.2~1/RELEASE_X86_64 x86_64

But it works on my Macbook，I am sorry that I cannot provide my Macbook run env.

[pamubay]

update your go or download official binaries from releases
Variable overwrites works since go1.11

More info:
support for variable overwrite
Hugo 0.48 release notes

[zhcppy]

So that's it, Thank you very much!

[github-actions]

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