unison/unison-src/transcripts/addupdatemessages.md

Adds and updates

Let's set up some definitions to start:

.> builtins.merge

x = 1
y = 2

type X = One Nat
type Y = Two Nat Nat

Expected: x and y, X, and Y exist as above. UCM tells you this.

.scratch> add

Let's add an alias for 1 and One:

z = 1

type Z = One Nat

Expected: z is now 1. UCM tells you that this definition is also called x. Also, Z is an alias for X.

.scratch> add

Let's update something that has an alias (to a value that doesn't have a name already):

x = 3
type X = Three Nat Nat Nat

Expected: x is now 3 and X has constructor Three. UCM tells you the old definitions were also called z and Z and these names have also been updated.

.scratch> update

Update it to something that already exists with a different name:

x = 2
type X = Two Nat Nat

Expected: x is now 2 and X is Two. UCM says the old definition was also named z/Z, and was also updated. And it says the new definition is also named y/Y.

.scratch> update