This code is perfectly valid in python 3:
f'{[x for x in range(5)]}'
Unfortunately the sonar scanner throws an exception:
[2020-01-23T00:00:35.709Z] WARN: Unable to analyze file 'foo.py'. Error: {} [2020-01-23T00:00:35.709Z] java.lang.IllegalArgumentException: Overlapping symbol declaration and reference for symbol at Range[from [line=41, lineOffset=15] to [line=41, lineOffset=18]] [2020-01-23T00:00:35.709Z] at org.sonar.api.utils.Preconditions.checkArgument(Preconditions.java:29) [2020-01-23T00:00:35.709Z] at org.sonar.api.batch.sensor.symbol.internal.DefaultSymbolTable$DefaultSymbol.newReference(DefaultSymbolTable.java:119) [2020-01-23T00:00:35.709Z] at org.sonar.api.batch.sensor.symbol.internal.DefaultSymbolTable$DefaultSymbol.newReference(DefaultSymbolTable.java:113) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.SymbolVisitor.handleSymbol(SymbolVisitor.java:96) [2020-01-23T00:00:35.709Z] at java.base/java.lang.Iterable.forEach(Iterable.java:75) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.SymbolVisitor.visitPyListOrSetCompExpression(SymbolVisitor.java:67) [2020-01-23T00:00:35.709Z] at org.sonar.python.tree.ComprehensionExpressionImpl.accept(ComprehensionExpressionImpl.java:72) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:33) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:40) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.visitStringElement(BaseTreeVisitor.java:314) [2020-01-23T00:00:35.709Z] at org.sonar.python.tree.StringElementImpl.accept(StringElementImpl.java:49) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:33) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:40) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.visitStringLiteral(BaseTreeVisitor.java:308) [2020-01-23T00:00:35.709Z] at org.sonar.python.tree.StringLiteralImpl.accept(StringLiteralImpl.java:45) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:33) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.visitParenthesizedExpression(BaseTreeVisitor.java:364) [2020-01-23T00:00:35.709Z] at org.sonar.python.tree.ParenthesizedExpressionImpl.accept(ParenthesizedExpressionImpl.java:60) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:33) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.visitAssertStatement(BaseTreeVisitor.java:78) [2020-01-23T00:00:35.709Z] at org.sonar.python.tree.AssertStatementImpl.accept(AssertStatementImpl.java:77) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:33) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:40) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.visitStatementList(BaseTreeVisitor.java:52) [2020-01-23T00:00:35.709Z] at org.sonar.python.tree.StatementListImpl.accept(StatementListImpl.java:46) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:33) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.visitFunctionDef(BaseTreeVisitor.java:133) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.SymbolVisitor.visitFunctionDef(SymbolVisitor.java:56) [2020-01-23T00:00:35.709Z] at org.sonar.python.tree.FunctionDefImpl.accept(FunctionDefImpl.java:164) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:33) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:40) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.visitStatementList(BaseTreeVisitor.java:52) [2020-01-23T00:00:35.709Z] at org.sonar.python.tree.StatementListImpl.accept(StatementListImpl.java:46) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:33) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.visitClassDef(BaseTreeVisitor.java:146) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.SymbolVisitor.visitClassDef(SymbolVisitor.java:50) [2020-01-23T00:00:35.709Z] at org.sonar.python.tree.ClassDefImpl.accept(ClassDefImpl.java:82) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:33) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:40) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.visitStatementList(BaseTreeVisitor.java:52) [2020-01-23T00:00:35.709Z] at org.sonar.python.tree.StatementListImpl.accept(StatementListImpl.java:46) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:33) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.api.tree.BaseTreeVisitor.visitFileInput(BaseTreeVisitor.java:47) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.SymbolVisitor.visitFileInput(SymbolVisitor.java:80) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.PythonScanner.scanFile(PythonScanner.java:123) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.PythonScanner.scanFiles(PythonScanner.java:86) [2020-01-23T00:00:35.709Z] at org.sonar.plugins.python.PythonSensor.execute(PythonSensor.java:76) [2020-01-23T00:00:35.709Z] at org.sonar.scanner.sensor.AbstractSensorWrapper.analyse(AbstractSensorWrapper.java:34) [2020-01-23T00:00:35.709Z] at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:71) [2020-01-23T00:00:35.709Z] at org.sonar.scanner.sensor.ModuleSensorsExecutor.lambda$execute$1(ModuleSensorsExecutor.java:45) [2020-01-23T00:00:35.709Z] at org.sonar.scanner.sensor.ModuleSensorsExecutor.withModuleStrategy(ModuleSensorsExecutor.java:63) [2020-01-23T00:00:35.709Z] at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:45) [2020-01-23T00:00:35.709Z] at org.sonar.scanner.scan.ModuleScanContainer.doAfterStart(ModuleScanContainer.java:68) [2020-01-23T00:00:35.709Z] at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:122) [2020-01-23T00:00:35.709Z] at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:108) [2020-01-23T00:00:35.709Z] at org.sonar.scanner.scan.ProjectScanContainer.scan(ProjectScanContainer.java:379) [2020-01-23T00:00:35.709Z] at org.sonar.scanner.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:375) [2020-01-23T00:00:35.709Z] at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:338) [2020-01-23T00:00:35.709Z] at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:122) [2020-01-23T00:00:35.709Z] at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:108) [2020-01-23T00:00:35.709Z] at org.sonar.scanner.bootstrap.GlobalContainer.doAfterStart(GlobalContainer.java:127) [2020-01-23T00:00:35.709Z] at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:122) [2020-01-23T00:00:35.709Z] at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:108) [2020-01-23T00:00:35.709Z] at org.sonar.batch.bootstrapper.Batch.doExecute(Batch.java:58) [2020-01-23T00:00:35.709Z] at org.sonar.batch.bootstrapper.Batch.execute(Batch.java:52) [2020-01-23T00:00:35.709Z] at org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher.execute(BatchIsolatedLauncher.java:46) [2020-01-23T00:00:35.709Z] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [2020-01-23T00:00:35.709Z] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [2020-01-23T00:00:35.709Z] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [2020-01-23T00:00:35.710Z] at java.base/java.lang.reflect.Method.invoke(Method.java:566) [2020-01-23T00:00:35.710Z] at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke(IsolatedLauncherProxy.java:60) [2020-01-23T00:00:35.710Z] at com.sun.proxy.$Proxy0.execute(Unknown Source) [2020-01-23T00:00:35.710Z] at org.sonarsource.scanner.api.EmbeddedScanner.doExecute(EmbeddedScanner.java:185) [2020-01-23T00:00:35.710Z] at org.sonarsource.scanner.api.EmbeddedScanner.execute(EmbeddedScanner.java:137) [2020-01-23T00:00:35.710Z] at org.sonarsource.scanner.cli.Main.execute(Main.java:111) [2020-01-23T00:00:35.710Z] at org.sonarsource.scanner.cli.Main.execute(Main.java:75) [2020-01-23T00:00:35.710Z] at org.sonarsource.scanner.cli.Main.main(Main.java:61) [2020-01-23T00:00:35.710Z]