daniellemaywood.uk
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1# Breaking changes to make for v2
2
3## `[1 ..]` syntax
4
5Due to a bug in the parser we accept `[1, ..]` as a valid list value.
6
7- [x] Emits warning when used.
8- [x] Formatter rewrites it to desired syntax.
9
10## `_ as a` syntax
11
12This pattern doesn't make sense as one could write `a` instead. We don't want
13two ways of doing the same thing.
14
15- [x] Emits warning when used.
16- [x] Formatter rewrites it to desired syntax.
17
18## Shadowing imported values
19
20Do not allow shadowing an imported value, the same way one can't define two
21top level functions with the same name.
22
23- [x] Emits warning when used.
24
25## Import one module multiple times
26
27Do not allow one module to be imported multiple times. This is currently
28accepted so long as each import uses a different alias.
29
30- [x] Emits warning when used.
31
32## JavaScript runtime error `fn` property
33
34On JavaScript there is a deprecated `fn` property. This was a mistake, it
35should have been `function`. It still exists today due to backwards
36compatibility.
37
38## Do not allow guard with no condition
39
40It doesn't make sense to have an `if` guard followed by no condition, but the
41compiler allows this: `case wibble { big if -> True }`
42
43- [x] Emits warning when used.
44- [x] Formatter rewrites it to desired syntax.