Bug in sql_fmgr when envoked via copy

A fresh cvs update of -HEAD produces the following when I attempt to import a
dump that has a domain using a SQL function as part of the check constraint.
This error only shows while using COPY for more than 1 row. Inserts work
fine. Find attached a simple self contained test case.

gdb ../bin/postgres postgres.core
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This GDB was configured as "i386-marcel-freebsd"...
Core was generated by `postgres'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libcrypt.so.3...done.
Loaded symbols for /lib/libcrypt.so.3
Reading symbols from /lib/libm.so.4...done.
Loaded symbols for /lib/libm.so.4
Reading symbols from /lib/libc.so.7...done.
Loaded symbols for /lib/libc.so.7
Reading symbols from /libexec/ld-elf.so.1...done.
Loaded symbols for /libexec/ld-elf.so.1
#0 0x0814cb65 in fmgr_sql (fcinfo=0xbfbfc6a0) at functions.c:621
621 if (es && es->status == F_EXEC_START)
(gdb) bt
#0 0x0814cb65 in fmgr_sql (fcinfo=0xbfbfc6a0) at functions.c:621
#1 0x08146615 in ExecMakeFunctionResultNoSets (fcache=0x85c0880,
econtext=0x858c0a8, isNull=0xbfbfca81 "", isDone=0x0) at execQual.c:1213
#2 0x081465b0 in ExecMakeFunctionResultNoSets (fcache=0x85c0428,
econtext=0x858c0a8, isNull=0xbfbfccc0 "", isDone=0x85c0c8c) at
execQual.c:1188
#3 0x081465b0 in ExecMakeFunctionResultNoSets (fcache=0x85c001c,
econtext=0x858c0a8, isNull=0xbfbfcf00 "", isDone=0x85c0ca0) at
execQual.c:1188
#4 0x081465b0 in ExecMakeFunctionResultNoSets (fcache=0x8588b70,
econtext=0x858c0a8, isNull=0xbfbfd140 "", isDone=0x85c0cd0) at
execQual.c:1188
#5 0x081465b0 in ExecMakeFunctionResultNoSets (fcache=0x8588764,
econtext=0x858c0a8, isNull=0xbfbfd21b "\b\034
\\\b$$D\bpÒ¿¿XÒ¿¿<Ô\035\b$$D\b\034 D\b½\002",
isDone=0x85c116c) at execQual.c:1188
#6 0x08148da0 in ExecEvalExprSwitchContext (expression=0xbfbfc6a0,
econtext=0x858a2a4,
isNull=0xbfbfd21b "\b\034 \\\b$$D\bpÒ¿¿XÒ¿¿<Ô\035\b$$D\b\034 D\b½\002",
isDone=0x0) at execQual.c:3085
#7 0x081dd334 in domain_check_input (value=140255260, isnull=0 '\0',
my_extra=0x8442424) at domains.c:150
#8 0x081dd43c in domain_in (fcinfo=0xbfbfd270) at domains.c:230
#9 0x08236cf1 in InputFunctionCall (flinfo=0x858a2a4, str=0x844201c "2",
typioparam=140249232, typmod=140249232) at fmgr.c:1715
#10 0x08110803 in DoCopy (stmt=0x844201c) at copy.c:1821
#11 0x081c6ea3 in ProcessUtility (parsetree=0x854a334, params=0x0,
dest=0x854a390, completionTag=0xbfbfd840 "") at utility.c:634
#12 0x081c5b0f in PortalRunUtility (portal=0x854e01c, query=0x854a3dc,
dest=0x854a390, completionTag=0xbfbfd840 "") at pquery.c:992
#13 0x081c60c9 in PortalRun (portal=0x854e01c, count=2147483647,
dest=0x854a390, altdest=0x854a390, completionTag=0xbfbfd840 "") at
pquery.c:1059
#14 0x081c20a8 in exec_simple_query (query_string=0x854a01c "copy sql_table
from stdin;") at postgres.c:1004
#15 0x081c4116 in PostgresMain (argc=4, argv=0x840b680, username=0x840b650
"pgsql") at postgres.c:3182
#16 0x0819d898 in ServerLoop () at postmaster.c:2845
#17 0x0819ed59 in PostmasterMain (argc=1, argv=0xbfbfed5c) at postmaster.c:949
#18 0x08162092 in main (argc=1, argv=0xbfbfed5c) at main.c:187

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