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Enum fields must be required or have a default.

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This is a breaking change, but the previous behaviour was broken so I'm
not concerned.

Also made most programmer errors more useful by giving type.field
context information.

Fixes #179.
This commit is contained in:
Alec Thomas
2021-06-21 20:32:40 +09:30
parent c494f8b8f3
commit 247574041d
7 changed files with 33 additions and 23 deletions
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README.md
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@@ -444,7 +444,7 @@ Tag | Description
`format:"X"` | Format for parsing input, if supported.
`sep:"X"` | Separator for sequences (defaults to ","). May be `none` to disable splitting.
`mapsep:"X"` | Separator for maps (defaults to ";"). May be `none` to disable splitting.
`enum:"X,Y,..."` | Set of valid values allowed for this flag.
`enum:"X,Y,..."` | Set of valid values allowed for this flag. An enum field must be `required` or have a valid `default`.
`group:"X"` | Logical group for a flag or command.
`xor:"X,Y,..."` | Exclusive OR groups for flags. Only one flag in the group can be used which is restricted within the same command. When combined with `required`, at least one of the `xor` group will be required.
`prefix:"X"` | Prefix for all sub-flags.