StringInterpolation.cs:
#    3| [Class] MyStringInterpolationClass
#    6|   5: [Method] M
#    6|     -1: [TypeMention] Void
#    7|     4: [BlockStmt] {...}
#    8|       0: [LocalVariableDeclStmt] ... ...;
#    8|         0: [LocalVariableDeclAndInitExpr] Single i = ...
#    8|           -1: [TypeMention] float
#    8|           0: [LocalVariableAccess] access to local variable i
#    8|           1: [FloatLiteral] 3.14159
#    9|       1: [LocalConstantDeclStmt] const ... ...;
#    9|         0: [LocalVariableDeclAndInitExpr] Int32 align = ...
#    9|           -1: [TypeMention] int
#    9|           0: [LocalVariableAccess] access to local variable align
#    9|           1: [IntLiteral] 5
#   10|       2: [LocalVariableDeclStmt] ... ...;
#   10|         0: [LocalVariableDeclAndInitExpr] String x1 = ...
#   10|           -1: [TypeMention] string
#   10|           0: [LocalVariableAccess] access to local variable x1
#   10|           1: [InterpolatedStringExpr] $"..."
#   10|             0: [StringLiteralUtf16] "Hello, Pi "
#   10|             1: [InterpolatedStringInsertExpr] {...}
#   10|               0: [LocalVariableAccess] access to local variable i
#   11|       3: [LocalVariableDeclStmt] ... ...;
#   11|         0: [LocalVariableDeclAndInitExpr] String x2 = ...
#   11|           -1: [TypeMention] string
#   11|           0: [LocalVariableAccess] access to local variable x2
#   11|           1: [InterpolatedStringExpr] $"..."
#   11|             0: [StringLiteralUtf16] "Hello, Pi "
#   11|             1: [InterpolatedStringInsertExpr] {...}
#   11|               0: [LocalVariableAccess] access to local variable i
#   11|               2: [StringLiteralUtf16] "F1"
#   12|       4: [LocalVariableDeclStmt] ... ...;
#   12|         0: [LocalVariableDeclAndInitExpr] String x3 = ...
#   12|           -1: [TypeMention] string
#   12|           0: [LocalVariableAccess] access to local variable x3
#   12|           1: [InterpolatedStringExpr] $"..."
#   12|             0: [StringLiteralUtf16] "Hello, Pi "
#   12|             1: [InterpolatedStringInsertExpr] {...}
#   12|               0: [LocalVariableAccess] access to local variable i
#   12|               1: [IntLiteral] 6
#   13|       5: [LocalVariableDeclStmt] ... ...;
#   13|         0: [LocalVariableDeclAndInitExpr] String x4 = ...
#   13|           -1: [TypeMention] string
#   13|           0: [LocalVariableAccess] access to local variable x4
#   13|           1: [InterpolatedStringExpr] $"..."
#   13|             0: [StringLiteralUtf16] "Hello, Pi "
#   13|             1: [InterpolatedStringInsertExpr] {...}
#   13|               0: [LocalVariableAccess] access to local variable i
#   13|               1: [IntLiteral] 6
#   13|               2: [StringLiteralUtf16] "F3"
#   14|       6: [LocalVariableDeclStmt] ... ...;
#   14|         0: [LocalVariableDeclAndInitExpr] String x5 = ...
#   14|           -1: [TypeMention] string
#   14|           0: [LocalVariableAccess] access to local variable x5
#   14|           1: [InterpolatedStringExpr] $"..."
#   14|             0: [StringLiteralUtf16] "Hello, Pi "
#   14|             1: [InterpolatedStringInsertExpr] {...}
#   14|               0: [LocalVariableAccess] access to local variable i
#   14|               1: [LocalVariableAccess] access to local variable align
#   15|       7: [LocalVariableDeclStmt] ... ...;
#   15|         0: [LocalVariableDeclAndInitExpr] String x6 = ...
#   15|           -1: [TypeMention] string
#   15|           0: [LocalVariableAccess] access to local variable x6
#   15|           1: [InterpolatedStringExpr] $"..."
#   15|             0: [StringLiteralUtf16] "Hello, Pi "
#   15|             1: [InterpolatedStringInsertExpr] {...}
#   15|               0: [LocalVariableAccess] access to local variable i
#   15|               1: [LocalVariableAccess] access to local variable align
#   15|               2: [StringLiteralUtf16] "F2"