`OverridingMethodInconsistentArgumentNamesChecker` fails when original function contains multiple parameters with the same name

[SquidDev]

Error-prone version: 2.45.0 BugPattern: OverridingMethodInconsistentArgumentNamesChecker

I have a codebase which depends on a partially obfuscated library (Minecraft modding, if interested. Nothing nefarious!). While the LVT is present for all functions, it has been mangled, and all parameters are called o. When overriding a function from this library, this causes OverridingMethodInconsistentArgumentNamesChecker to crash, as that (reasonably) expects all parameters to have a unique name.

Stack trace

 java.lang.IllegalArgumentException: Multiple entries with same key: o=0 and o=1
at com.google.common.collect.ImmutableMap.conflictException(ImmutableMap.java:382)
at com.google.common.collect.ImmutableMap.checkNoConflict(ImmutableMap.java:376)
at com.google.common.collect.RegularImmutableMap.checkNoConflictInKeyBucket(RegularImmutableMap.java:246)
at com.google.common.collect.RegularImmutableBiMap.fromEntryArray(RegularImmutableBiMap.java:98)
at com.google.common.collect.ImmutableBiMap$Builder.buildOrThrow(ImmutableBiMap.java:479)
at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:686)
at com.google.errorprone.bugpatterns.OverridingMethodInconsistentArgumentNamesChecker.getParams(OverridingMethodInconsistentArgumentNamesChecker.java:72)
at com.google.errorprone.bugpatterns.OverridingMethodInconsistentArgumentNamesChecker.matchMethod(OverridingMethodInconsistentArgumentNamesChecker.java:53)
at com.google.errorprone.scanner.ErrorProneScanner.processMatchers(ErrorProneScanner.java:539)
at com.google.errorprone.scanner.ErrorProneScanner.visitMethod(ErrorProneScanner.java:881)
at com.google.errorprone.scanner.ErrorProneScanner.visitMethod(ErrorProneScanner.java:178)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:948)
at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:92)
at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:96)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:111)
at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:119)
at jdk.compiler/com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:203)
at com.google.errorprone.scanner.ErrorProneScanner.visitClass(ErrorProneScanner.java:649)
at com.google.errorprone.scanner.ErrorProneScanner.visitClass(ErrorProneScanner.java:178)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:855)
at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:92)
at com.google.errorprone.scanner.Scanner.scan(Scanner.java:74)
at com.google.errorprone.scanner.Scanner.scan(Scanner.java:48)
at jdk.compiler/com.sun.source.util.TreeScanner.scan(TreeScanner.java:111)
at jdk.compiler/com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:119)
at jdk.compiler/com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:152)
at com.google.errorprone.scanner.ErrorProneScanner.visitCompilationUnit(ErrorProneScanner.java:661)
at com.google.errorprone.scanner.ErrorProneScanner.visitCompilationUnit(ErrorProneScanner.java:178)
at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:623)
at jdk.compiler/com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:66)
at com.google.errorprone.scanner.Scanner.scan(Scanner.java:58)
at com.google.errorprone.scanner.ErrorProneScannerTransformer.apply(ErrorProneScannerTransformer.java:43)
at com.google.errorprone.ErrorProneAnalyzer.finished(ErrorProneAnalyzer.java:231)
at jdk.compiler/com.sun.tools.javac.api.MultiTaskListener.finished(MultiTaskListener.java:133)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1436)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1383)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:963)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0(JavacTaskImpl.java:104)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.invocationHelper(JavacTaskImpl.java:152)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:100)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:94)

As such a class cannot be created from Java source code directly, there's not really an easy reproducer here. Happy to put one together using org.ow2.asm if useful? Also happy if you just want to close as "won't fix", as I realise this is a bit of a silly use-case!