Chapel: invalid token when using select statement with negative integer values

[LeDemz]

Summary of Problem

When using a select statement with a negative integer, the program produces an invalid token error. (Invalid token: near '�'). This is a bummer since I wanted to use the select statement to print out debug information for specific codes given by an external C library.

Steps to Reproduce

Source Code:

proc main()
{

var errorCode :int = -1;

select errorCode
{
    when 0 do  writeln("no error");
    when −1 do writeln("error present");
    when −2 do writeln("error present");
    when −3 do writeln("error present");
}
}

// Please provide source code that will reproduce the problem.
// You can insert your code inline if it's not too long.
// Otherwise, you can attach it as a file or provide a URL to it.
// To the extent possible, providing simplified programs demonstrating the
// problem will be appreciated.
// You can also replace this section with "Associated Future Test(s)" below.

` **Compile command:** <!-- e.g.chpl foo.chpl--> chpl main.chpl **Execution command:** <!-- e.g../foo -nl 4 If an input file is required, include it as well. --> ./main -nl 1 **Associated Future Test(s):** <!-- Are there any tests in Chapel's test system that demonstrate this issue? e.g. [test/path/to/foo.chpl`](
https://github.com/chapel-lang/chapel/blob/master/test/path/to/foo.chpl
) #1234 -->

Configuration Information

• Output of chpl --version: chpl version 1.20.0
• Output of $CHPL_HOME/util/printchplenv --anonymize: CHPL_TARGET_PLATFORM: linux64
  CHPL_TARGET_COMPILER: gnu
  CHPL_TARGET_ARCH: x86_64
  CHPL_TARGET_CPU: native *
  CHPL_LOCALE_MODEL: flat
  CHPL_COMM: gasnet *
  CHPL_COMM_SUBSTRATE: smp *
  CHPL_GASNET_SEGMENT: fast *
  CHPL_TASKS: qthreads
  CHPL_LAUNCHER: smp *
  CHPL_TIMERS: generic
  CHPL_UNWIND: none
  CHPL_MEM: jemalloc
  CHPL_ATOMICS: cstdlib
  CHPL_NETWORK_ATOMICS: none
  CHPL_GMP: gmp
  CHPL_HWLOC: hwloc
  CHPL_REGEXP: re2
  CHPL_LLVM: llvm *
  CHPL_AUX_FILESYS: none
• Back-end compiler and version, e.g. gcc --version or clang --version: gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0
• (For Cray systems only) Output of module list:

[bradcray]

@LeDemz: I think there may be some invisible garbage characters in your source code (?). Specifically, if I cut and paste your code into TIO I see similar failures to what you report: https://tio.run/##S85ILEjN@f@/oCg/WSE3MTNPQ5OrmourLLFIIbWoKL/IOT8lVcEqM69EwVZB19Cai6s4NSc1uQQhCVStAATlGal5CgYKKflAZlFmSWpOnoZSXj5EmZKmNULNo45JhiBlcFVgJQoFRanFqXkl6EqNiFdqjF9pLVft//8A

But if I re-type the code in the lines being reported from scratch, it works as expected: https://tio.run/##jcqxCsJAEIThfp9iSJUUAaOdwconOS4LOTh3j82hheTZz1PBYCNO9cN8fnaJYynJ1OPigrQd3YmuzsBmamedGMcgGSf0w0i0cGSft7Nq1N1mFuwwaU0LmaO0jeibNd24mX54oo95ASTjhSV/w/2/8PAbrrSW8gA

[daviditen]

The minus signs for the three negative values in the select statement are unicode minus signs 0xE28892 instead of ascii 0x2D.

[bradcray]

Ah, thanks for figuring out what wasn't clear to me, David! This relates somewhat to https://github.com/chapel-lang/chapel/issues/14282 then (the degree to which we could / should permit UTF-8 characters which are arguably similar / equivalents to the ASCII characters we accept today).

[LeDemz]

Yep! Problem fixed :)