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During protocol witness matching for a protocol requirement with `@differentiable` attributes, implicit `@differentiable` attributes may be created for the witness under specific conditions (when the witness has a `@differentiable` attribute with superset differentiability parameters, or when the witness has less-than-public visibility). Do not generate implicit `@differentiable` attributes for protocol witnesses when the protocol conformance is declared from a separate file or type context from the witness. Resolves SR-13455.
13 lines
516 B
Swift
13 lines
516 B
Swift
// RUN: %target-swift-frontend -c -verify -primary-file %s %S/Inputs/other_file_protocol_default_implementation_witness.swift
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// SR-13455: Test missing protocol requirement `@differentiable` attribute
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// errors for protocol witnesses declared in a different file than the protocol
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// conformance.
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//
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// This test case specifically tests protocol extension method witnesses.
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import _Differentiation
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// expected-error @+1 {{type 'ConformingStruct' does not conform to protocol 'P1'}}
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struct ConformingStruct: P2 {}
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