Mostyn Bramley-Moore 500d6b04e6 Report the source of a value when we cannot parse it ...

If you allow a flag to be set from environment variables or files and
a parse error occurs from one of them, it is very useful for the error
message to mention where the value came from.

Without this, it can be difficult to notice an error caused by an
unexpected environment variable being set.

Implements #1167.

2020-11-03 23:57:00 +01:00

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