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Merge pull request #4281 from lucacervello/suggest-lambda-operator

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Add suggest lambda operator instead of when
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Richard Feldman 2022-10-31 10:29:46 -07:00 • committed by GitHub
commit bc2ec738a0
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2 changed files with 15 additions and 4 deletions
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11
crates/reporting/src/error/parse.rs
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@ -259,6 +259,17 @@ fn to_expr_report<'a>(
Context::InNode(Node::WhenBranch, _pos, _) => { Context::InNode(Node::WhenBranch, _pos, _) => {
return to_unexpected_arrow_report(alloc, lines, filename, *pos, start); return to_unexpected_arrow_report(alloc, lines, filename, *pos, start);
} }
Context::InDef(_pos) => {
vec![alloc.stack([
alloc.reflow("Looks like you are trying to define a function. "),
alloc.reflow("In roc, functions are always written as a lambda, like "),
alloc
.parser_suggestion("increment = \\n -> n + 1")
.indent(4),
])]
}
_ => { _ => {
vec![alloc.stack([ vec![alloc.stack([
alloc.concat([ alloc.concat([

8
crates/reporting/tests/test_reporting.rs
View file

@ -5653,11 +5653,11 @@ All branches in an `if` must have the same type!
4│ main = 5 -> 3 4│ main = 5 -> 3
^^ ^^
The arrow -> is only used to define cases in a `when`. Looks like you are trying to define a function.
when color is In roc, functions are always written as a lambda, like
Red -> "stop!"
Green -> "go!" increment = \n -> n + 1
"### "###
); );