It seems that if the MODE parameter in a three args open contains IO layers and the third one is a scalar reference, then the latter is not open()ed in memory, but its stringification is interpreted as a filename:

picard:~ [10:30:46]$ perl -MFatal=open -e 'open F, "<", \"foo"'
picard:~ [10:31:02]$ ^<^<:raw
perl -MFatal=open -e 'open F, "<:raw", \"foo"'
Can't open(F, <:raw, SCALAR(0x814fe04)): No such file or directory at 
+(eval 1) line 3
        main::__ANON__('F', '<:raw', 'SCALAR(0x814fe04)') called at -e
+ line 1

[download]

and

picard:~ [10:35:09]$ perl -MFatal=open -e 'open F, ">", \$a'
picard:~ [10:35:11]$ ^>^>:raw
perl -MFatal=open -e 'open F, ">:raw", \$a'
picard:~ [10:35:34]$ ls SCALAR\(0x814fe04\)
SCALAR(0x814fe04)

[download]

Is this expected, documented, etc? I don't see anything in open()'s documentation to this effect...

In reply to Clash between IO layers and "in memory" files? by blazar

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