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This would just set the NominalTypeDecl's declared type to ErrorType, which caused problems elsewhere. Instead, generalize the logic used for AbstractFunctionDecl. This correctly wires up the GenericTypeParamDecl's archetypes even if the signature didn't validate, fixing crashes if the generic parameters of the type are referenced.
These test cases under MIT License: The MIT License (MIT) Copyright (c) 2014 practicalswift Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Repository: https://github.com/practicalswift/swift-compiler-crashes.git Web URL: https://github.com/practicalswift/swift-compiler-crashes Tests updated as of revision 75c8eac27530ed891be4104485129820572c3fd1