diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/todo/RevertableProperty_with_NoInfo.mdwn | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/todo/RevertableProperty_with_NoInfo.mdwn b/doc/todo/RevertableProperty_with_NoInfo.mdwn new file mode 100644 index 00000000..3b4a61a9 --- /dev/null +++ b/doc/todo/RevertableProperty_with_NoInfo.mdwn @@ -0,0 +1,18 @@ +Currently, a RevertableProperty's Properties always both HasInfo. This +means that if a Property NoInfo is updated to be a RevertableProperty, and +someplace called ensureProperty on it, that will refuse to compile. + +The workaround is generally to export the original NoInfo property under +a different name, so it can still be used with ensureProperty. + +This could be fixed: + + data RevertableProperty i1 i2 where + RProp :: Property i1 -> Property i2 -> RevertableProperty i1 i2 + +However, needing to write "RevertableProperty HasInfo NoInfo" is quite +a mouthful! + +Since only 2 places in the propellor source code currently need to deal +with this, it doesn't currently seem worth making the change, unless a less +intrusive way can be found. |