[SR-10206] Linux Swift 5 compiler crash

[keith]

Previous ID	SR-10206
Radar	rdar://problem/49380933
Original Reporter	@keith
Type	Bug

Environment

Ubuntu 18.04

Swift version 5.0 (swift-5.0-RELEASE)
Target: x86_64-unknown-linux-gnu

Additional Detail from JIRA

Votes	1
Component/s	Compiler
Labels	Bug, 5.0Regression, CompilerCrash
Assignee	None
Priority	Medium

md5: ccca405c547b834e4db17bd67e989462

Issue Description:

When running tests for PathKit at this commit kylef/PathKit@4151a7e on Linux, the compiler crashes with this error:

# swift test
swift: /home/buildnode/jenkins/workspace/oss-swift-5.0-package-linux-ubuntu-18_04/swift/include/swift/SIL/TypeLowering.h:765: swift::SILType swift::Lowering::TypeConverter::getLoweredLoadableType(swift::Type): Assertion `(ti.isLoadable() || !SILModuleConventions(M).useLoweredAddresses()) && "unexpected address-only type"' failed.
Stack dump:
0.      Program arguments: /usr/local/bin/swift -frontend -c -primary-file /code/containers/swiftbase/PathKit/Tests/PathKitTests/PathKitSpec.swift /code/containers/swiftbase/PathKit/Tests/PathKitTests/XCTest.swift -emit-module-path /code/containers/swiftbase/PathKit/.build/x86_64-unknown-linux/debug/PathKitTests.build/PathKitSpec~partial.swiftmodule -emit-module-doc-path /code/containers/swiftbase/PathKit/.build/x86_64-unknown-linux/debug/PathKitTests.build/PathKitSpec~partial.swiftdoc -emit-dependencies-path /code/containers/swiftbase/PathKit/.build/x86_64-unknown-linux/debug/PathKitTests.build/PathKitSpec.d -emit-reference-dependencies-path /code/containers/swiftbase/PathKit/.build/x86_64-unknown-linux/debug/PathKitTests.build/PathKitSpec.swiftdeps -target x86_64-unknown-linux -disable-objc-interop -sdk / -I /code/containers/swiftbase/PathKit/.build/x86_64-unknown-linux/debug -enable-testing -g -module-cache-path /code/containers/swiftbase/PathKit/.build/x86_64-unknown-linux/debug/ModuleCache -swift-version 4.2 -Onone -D SWIFT_PACKAGE -D DEBUG -color-diagnostics -enable-anonymous-context-mangled-names -parse-as-library -module-name PathKitTests -o /code/containers/swiftbase/PathKit/.build/x86_64-unknown-linux/debug/PathKitTests.build/PathKitSpec.swift.o -index-store-path /code/containers/swiftbase/PathKit/.build/x86_64-unknown-linux/debug/index/store -index-system-modules
1.      While emitting SIL for 'testPathKit()' (at /code/containers/swiftbase/PathKit/Tests/PathKitTests/PathKitSpec.swift:10:8)
2.      While silgen emitFunction SIL function "@$s12PathKitTests04testaB0yyF".
 for 'testPathKit()' (at /code/containers/swiftbase/PathKit/Tests/PathKitTests/PathKitSpec.swift:10:8)
3.      While silgen closureexpr SIL function "@$s12PathKitTests04testaB0yyFy7Spectre11ContextType_pXEfU_".
 for expression at [/code/containers/swiftbase/PathKit/Tests/PathKitTests/PathKitSpec.swift:11:21 - line:512:1] RangeText="{
  let fixtures = Path(#file).parent() + "Fixtures"

[keith]

A found a diff that works around the issue:

diff --git a/Tests/PathKitTests/PathKitSpec.swift b/Tests/PathKitTests/PathKitSpec.swift
index ad63e9d..e683d99 100644
--- a/Tests/PathKitTests/PathKitSpec.swift
+++ b/Tests/PathKitTests/PathKitSpec.swift
@@ -9,10 +9,11 @@ func == (lhs:ThrowError, rhs:ThrowError) -> Bool { return true }

 public func testPathKit() {
 describe("PathKit") {
-  let fixtures = Path(#file).parent() + "Fixtures"
+  let filePath = #file
+  let fixtures = Path(filePath).parent() + "Fixtures"

   $0.before {
-    Path.current = Path(#file).parent()
+    Path.current = Path(filePath).parent()
   }

   $0.it("provides the system separator") {

[belkadan]

Just to check, this same commit builds fine with Swift 4.2?

[keith]

Yes it does with `Swift version 4.2.1 (swift-4.2.1-RELEASE)`

Also note this fails with tools-version 4.2 and 5.0 with the 5.0 release