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[CSBindings] Delay inference through OptionalObject if "object" is l-value capable

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Inference cannot be allowed in cases where both sides are type
variables and optional type is l-value capable because it results
in binding "optional" to an optional type and later discovering
a contextual type that is l-value optional i.e. if "optional type"
is resolved by selecting subscript overload.
This commit is contained in:
Pavel Yaskevich
2023-10-19 16:13:38 -07:00
parent cfe27287da
commit 7654afd3e6
2 changed files with 28 additions and 8 deletions
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15
test/Constraints/diagnostics.swift
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@@ -1123,9 +1123,11 @@ func rdar17170728() {
var j: Int?
var k: Int? = 2
let _ = [i, j, k].reduce(0 as Int?) {
let _ = [i, j, k].reduce(0 as Int?) { // expected-error {{missing argument label 'into:' in call}}
// expected-error@-1 {{cannot convert value of type 'Int?' to expected argument type '(inout @escaping (Bool, Bool) -> Bool?, Int?) throws -> ()'}}
$0 && $1 ? $0! + $1! : ($0 ? $0! : ($1 ? $1! : nil))
// expected-error@-1 4 {{optional type 'Int?' cannot be used as a boolean; test for '!= nil' instead}}
// expected-error@-1 {{binary operator '+' cannot be applied to two 'Bool' operands}}
// expected-error@-2 4 {{cannot force unwrap value of non-optional type 'Bool'}}
}
let _ = [i, j, k].reduce(0 as Int?) { // expected-error {{missing argument label 'into:' in call}}
@@ -1556,18 +1558,17 @@ func testNilCoalescingOperatorRemoveFix() {
let _ = "" /* This is a comment */ ?? "" // expected-warning {{left side of nil coalescing operator '??' has non-optional type 'String', so the right side is never used}} {{13-43=}}
let _ = "" // This is a comment
?? "" // expected-warning {{left side of nil coalescing operator '??' has non-optional type 'String', so the right side is never used}} {{1558:13-1559:10=}}
?? "" // expected-warning {{left side of nil coalescing operator '??' has non-optional type 'String', so the right side is never used}} {{1560:13-1561:10=}}
let _ = "" // This is a comment
/*
* The blank line below is part of the test case, do not delete it
*/
?? "" // expected-warning {{left side of nil coalescing operator '??' has non-optional type 'String', so the right side is never used}} {{1563:13-1567:10=}}
?? "" // expected-warning {{left side of nil coalescing operator '??' has non-optional type 'String', so the right side is never used}} {{1561:13-1566:10=}}
if ("" ?? // This is a comment // expected-warning {{left side of nil coalescing operator '??' has non-optional type 'String', so the right side is never used}} {{9-1569:9=}}
if ("" ?? // This is a comment // expected-warning {{left side of nil coalescing operator '??' has non-optional type 'String', so the right side is never used}} {{9-1570:9=}}
"").isEmpty {}
if ("" // This is a comment
?? "").isEmpty {} // expected-warning {{left side of nil coalescing operator '??' has non-optional type 'String', so the right side is never used}} {{1571:9-1572:12=}}
?? "").isEmpty {} // expected-warning {{left side of nil coalescing operator '??' has non-optional type 'String', so the right side is never used}} {{1572:9-1573:12=}}
}