[Bug]: NullPointerException with `__debug__` type parameter

[correctmost]

Describe the bug

GraalPy crashes when running this fuzzed code:

def f[__debug__](): ...

Operating system

Linux

CPU architecture

x86_64

GraalPy version

GraalPy 3.12.8 (Oracle GraalVM Native 25.2.4)

JDK version

No response

Context configuration

No response

Steps to reproduce

Snippet listed above

Expected behavior

No crash

Stack trace

Stack trace is imprecise, the top frames are missing and/or have wrong line numbers. To get precise stack traces, build the image with option -H:-ReduceImplicitExceptionStackTraceInformation
java.lang.NullPointerException: Stack trace is imprecise, the top frames are missing and/or have wrong line numbers. To get precise stack traces, build the image with option -H:-ReduceImplicitExceptionStackTraceInformation
	at org.graalvm.py/com.oracle.graal.python.compiler.ParserCallbacksImpl.raiseSyntaxError(ParserCallbacksImpl.java:126)
	at org.graalvm.py/com.oracle.graal.python.compiler.ParserCallbacksImpl.raiseSyntaxError(ParserCallbacksImpl.java:122)
	at org.graalvm.py/com.oracle.graal.python.compiler.ParserCallbacksImpl.onError(ParserCallbacksImpl.java:118)
	at org.graalvm.py/com.oracle.graal.python.compiler.SSTUtils.checkForbiddenName(SSTUtils.java:90)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.checkForbiddenName(RootNodeCompiler.java:651)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.checkForbiddenName(RootNodeCompiler.java:642)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.emitNameOperation(RootNodeCompiler.java:1773)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.beginStoreLocal(RootNodeCompiler.java:1815)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler$StatementCompiler.visit(RootNodeCompiler.java:7036)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler$StatementCompiler.visit(RootNodeCompiler.java:1957)
	at org.graalvm.py/com.oracle.graal.python.pegparser.sst.TypeParamTy$TypeVar.accept(TypeParamTy.java:69)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler$StatementCompiler.visitTypeParams(RootNodeCompiler.java:3479)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.lambda$compileFunctionTypeParams$0(RootNodeCompiler.java:1136)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen$Bytecode.create(PBytecodeDSLRootNodeGen.java:5553)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen.create(PBytecodeDSLRootNodeGen.java:4156)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.compileRootNode(RootNodeCompiler.java:514)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.compileFunctionTypeParams(RootNodeCompiler.java:1129)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler$StatementCompiler.emitFunctionDef(RootNodeCompiler.java:4388)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler$StatementCompiler.visit(RootNodeCompiler.java:4352)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler$StatementCompiler.visit(RootNodeCompiler.java:1957)
	at org.graalvm.py/com.oracle.graal.python.pegparser.sst.StmtTy$FunctionDef.accept(StmtTy.java:84)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.visitModuleBody(RootNodeCompiler.java:1074)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.lambda$visit$0(RootNodeCompiler.java:991)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen$Bytecode.create(PBytecodeDSLRootNodeGen.java:5553)
	at org.graalvm.py/com.oracle.graal.python.nodes.bytecode_dsl.PBytecodeDSLRootNodeGen.create(PBytecodeDSLRootNodeGen.java:4156)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.compileRootNode(RootNodeCompiler.java:514)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.visit(RootNodeCompiler.java:989)
	at org.graalvm.py/com.oracle.graal.python.compiler.bytecode_dsl.RootNodeCompiler.visit(RootNodeCompiler.java:183)
	at org.graalvm.py/com.oracle.graal.python.pegparser.sst.ModTy$Module.accept(ModTy.java:68)
[...snip...]

Additional context

No response