🚨 Error: Doc factory failed: amp-mustache: d is not a function

[ampprojectbot]

Details

Error report: link
First seen: Mar 17, 2021
Frequency: ~ 48/day

Stacktrace

Error: Doc factory failed:  amp-mustache: d is not a function
    at src/service/template-impl.js:303:6
    at src/service/extensions-impl.js:495:10
    at forEach (src/service/extensions-impl.js:493:26)

Notes

@dvoytenko modified src/service/template-impl.js:302-307 in #3682 (Jun 21, 2016)
@dvoytenko modified src/service/extensions-impl.js:494-499 in #10992 (Aug 28, 2017)
@renovate-bot modified src/service/extensions-impl.js:493-493 in #27350 (Mar 30, 2020)

Seen in:

• 03-18 Nightly (0351)

Possible assignees: @dvoytenko

/cc @ampproject/release-on-duty

[rcebulko]

Appears related to ampproject/amphtml#33125 albeit with a different error message. Stackdriver seems to be grouping them together, despite very different stacktraces. Unclear why

[dvoytenko]

From what I can tell this is a mostly benign error. But what concerns me there is that a user assert two lines up is not executed. Did we accidentally strip userAsserts with devAsserts?