streams module fails to compile when using -d:useNimRTL and -mm:arc

[bbbscarter]

Description

Repro steps:

• Create a nim file with the following:
  import streams
• Compile with nim c -d:useNimRtl
• Observe compile error
• Remove -d:useNimRTL or use -mm:refc
• Observe the error goes away.

Nim Version

2.02 (and most recent head revision 20d79c9).

Current Output

`/Users/scarter/dev/nim/nim-source/lib/pure/streams.nim(1306, 30) Error: type mismatch: got 'proc (s: Stream, buffer: var string, slice: Slice[system.int]): int{.noSideEffect, gcsafe.}' for 'ssReadDataStr' but expected 'proc (s: Stream, buffer: var string, slice: Slice[system.int]): int{.nimcall, gcsafe.}'
.raise effects differ`

Expected Output

No response

Possible Solution

No response

Additional Information

Unfortunately, the workarounds of removing useNimRtl or mm:refc aren't viable for my use-case; I'm building an application with shared modules and:

• Without useNimRtl 'assert' silently hangs the app.
• Using mm:refc causes a segfault when copying strings (trying to create a minimal repro at the moment).