[jdk11u-dev] RFR: 8211148: var in implicit lambdas shouldn't be accepted for source < 11 [v2]

[Goetz Lindenmaier]

> I would like to backport this to jdk11u-dev. 
> 
> Applies clean except for trivial context resolve in Source.java

Goetz Lindenmaier has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Backport 2589e9733e054c164a64112db80e25fefd6dd222

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Changes:
  - all: https://git.openjdk.java.net/jdk11u-dev/pull/497/files
  - new: https://git.openjdk.java.net/jdk11u-dev/pull/497/files/6685ef94..8c4b9b6b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=497&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=497&range=00-01

  Stats: 38 lines in 2 files changed: 38 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/497.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/497/head:pull/497

PR: https://git.openjdk.java.net/jdk11u-dev/pull/497