csharp73.cs:
#    5| [Class] StackAllocs
#    7|   5: [Method] Fn
#    8|     4: [BlockStmt] {...}
#    9|       0: [LocalVariableDeclStmt] ... ...;
#    9|         0: [LocalVariableDeclAndInitExpr] Char* arr1 = ...
#    9|           0: [Stackalloc] array creation of type Char*
#    9|             -1: [ArrayInitializer] { ..., ... }
#    9|               0: [CharLiteral] x
#    9|               1: [CharLiteral] y
#    9|           1: [LocalVariableAccess] access to local variable arr1
#   10|       1: [LocalVariableDeclStmt] ... ...;
#   10|         0: [LocalVariableDeclAndInitExpr] Char* arr2 = ...
#   10|           0: [Stackalloc] array creation of type Char*
#   10|             -1: [ArrayInitializer] { ..., ... }
#   10|               0: [CharLiteral] x
#   10|             0: [IntLiteral] 1
#   10|           1: [LocalVariableAccess] access to local variable arr2
#   11|       2: [LocalVariableDeclStmt] ... ...;
#   11|         0: [LocalVariableDeclAndInitExpr] Char[] arr3 = ...
#   11|           0: [ArrayCreation] array creation of type Char[]
#   11|             -1: [ArrayInitializer] { ..., ... }
#   11|               0: [CharLiteral] x
#   11|           1: [LocalVariableAccess] access to local variable arr3
#   12|       3: [LocalVariableDeclStmt] ... ...;
#   12|         0: [LocalVariableDeclAndInitExpr] Char* arr4 = ...
#   12|           0: [Stackalloc] array creation of type Char*
#   12|             0: [IntLiteral] 10
#   12|           1: [LocalVariableAccess] access to local variable arr4
#   13|       4: [LocalVariableDeclStmt] ... ...;
#   13|         0: [LocalVariableDeclAndInitExpr] Char[] arr5 = ...
#   13|           0: [ArrayCreation] array creation of type Char[]
#   13|             0: [IntLiteral] 10
#   13|           1: [LocalVariableAccess] access to local variable arr5
#   14|       5: [LocalVariableDeclStmt] ... ...;
#   14|         0: [LocalVariableDeclAndInitExpr] Int32* arr6 = ...
#   14|           0: [Stackalloc] array creation of type Int32*
#   14|             -1: [ArrayInitializer] { ..., ... }
#   14|               0: [IntLiteral] 1
#   14|               1: [IntLiteral] 2
#   14|               2: [IntLiteral] 3
#   14|           1: [LocalVariableAccess] access to local variable arr6
#   18| [Class] PinnedReference
#   20|   5: [Method] F
#   21|     4: [BlockStmt] {...}
#   22|       0: [LocalVariableDeclStmt] ... ...;
#   22|         0: [LocalVariableDeclAndInitExpr] Span<Int32> t = ...
#   22|           0: [OperatorCall] call to operator implicit conversion
#   22|             0: [ArrayCreation] array creation of type Int32[]
#   22|               0: [IntLiteral] 10
#   22|           1: [LocalVariableAccess] access to local variable t
#   25|       1: [BlockStmt] {...}
#   30| [Class] UnmanagedConstraint<>
#-----|   1: (Type parameters)
#   30|     0: [TypeParameter] T
#   34| [Class] EnumConstraint<>
#-----|   1: (Type parameters)
#   34|     0: [TypeParameter] T
#   38| [Class] DelegateConstraint<>
#-----|   1: (Type parameters)
#   38|     0: [TypeParameter] T
#   42| [Class] ExpressionVariables
#   44|   4: [InstanceConstructor] ExpressionVariables
#-----|     2: (Parameters)
#   44|       0: [Parameter] x
#   45|     4: [BlockStmt] {...}
#   46|       0: [ExprStmt] ...;
#   46|         0: [AssignExpr] ... = ...
#   46|           0: [IntLiteral] 5
#   46|           1: [ParameterAccess] access to parameter x
#   49|   5: [InstanceConstructor] ExpressionVariables
#   49|     3: [ConstructorInitializer] call to constructor ExpressionVariables
#   49|       0: [LocalVariableDeclExpr] Int32 x
#   50|     4: [BlockStmt] {...}
#   51|       0: [ExprStmt] ...;
#   51|         0: [MethodCall] call to method WriteLine
#   51|           -1: [TypeAccess] access to type Console
#   51|           0: [InterpolatedStringExpr] $"..."
#   51|             0: [StringLiteral] "x is "
#   51|             1: [LocalVariableAccess] access to local variable x