1543644 - "internal error while computing Intl data" for "ja-u-ca-japanese" with "era" option

Status: RESOLVED FIXED

(Core :: JavaScript: Internationalization API, defect)

Description

[André Bargull [:anba]]

Requesting "era" field for Japanese calendar with Japanese locale throws an error:

js> print(new Intl.DateTimeFormat("ja-u-ca-japanese", {era:"short"}).format(new Date(2019,0,1)))
typein:1:66 Error: internal error while computing Intl data
Stack:
  @typein:1:66

No error is thrown for other locales:

js> print(new Intl.DateTimeFormat("en-u-ca-japanese", {era:"short"}).format(new Date(2019,0,1))) 
1 1, 31 Heisei

Regression from the ICU update in bug 1533481.

Tentatively setting as depends on bug 1543642, in case the update to ICU 64.2 will fix this bug.

Comment 1

[André Bargull [:anba]]

Attachment: Bug 1543644: Include RBNF data for Japanese to support Gannen year representation. r=jwalden!

ICU changes the numbering system of date formats which include an era marker
to "jpanyear". "jpanyear" is a rule-based numbering system and therefore the
RBNF data for the Japanese locale now need to be included.

Comment 2

[André Bargull [:anba]]

[Tracking Requested - why for this release]:
Regression from bug 1533481, which will land in Firefox 68. (Currently an inscrutable error is thrown when requesting to display the "era" for Japanese locale with Japanese calendar.)

Comment 3

[André Bargull [:anba]]

Try: https://treeherder.mozilla.org/#/jobs?repo=try&revision=4d9d973dcc9d9f3340aba771bc7ed327e4988104

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/4802b506ce33
Include RBNF data for Japanese to support Gannen year representation. r=jwalden

Comment 5

[Stefan Hindli [:stefan_hindli]]

https://hg.mozilla.org/mozilla-central/rev/4802b506ce33