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Resolve an ambiguity with the multiple-trailing-closure syntax in favor of parsing default: labels.

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John McCall
2020-04-16 00:59:41 -04:00
parent 938c84f5f7
commit 40836a0045
2 changed files with 13 additions and 2 deletions
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7
test/Parse/multiple_trailing_closures.swift
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@@ -116,3 +116,10 @@ func test_multiple_trailing_syntax_without_labels() {
_: {}
_: {}
}
func produce(fn: () -> Int?, default d: () -> Int) -> Int { // expected-note {{declared here}}
return fn() ?? d()
}
// TODO: The diagnostics here are perhaps a little overboard.
_ = produce { 0 } default: { 1 } // expected-error {{missing argument for parameter 'fn' in call}} expected-error {{consecutive statements}} expected-error {{'default' label can only appear inside a 'switch' statement}} expected-error {{top-level statement cannot begin with a closure expression}} expected-error {{closure expression is unused}} expected-note {{did you mean to use a 'do' statement?}}
_ = produce { 2 } `default`: { 3 }