0 or 1 relation fails about erd

[rrooij]

Person *--0 Location

is now:

Person *--? Location

[BurntSushi]

Please include a full reproducible example of the problem...

[adamist521]

Sorry.
Just edited simple.er.

# Entities are declared in '[' ... ']'. All attributes after the entity header
# up until the end of the file (or the next entity declaration) correspond
# to this entity.
[Person]
*name
height
weight
+birth_location_id

[Location]
*id
city
state
country

# Each relationship must be between exactly two entities, which need not
# be distinct. Each entity in the relationship has exactly one of four
# possible cardinalities:
#
# Cardinality    Syntax
# 0 or 1         0
# exactly 1      1
# 0 or more      *
# 1 or more      +
# Person *--1 Location
Person *--0 Location

Executing erd gives following error.

.stack-work/install/x86_64-osx/lts-8.12/8.0.2/bin/erd -i examples/simple.er -o examples/simple.pdf
"examples/simple.er" (line 26, column 11):
unexpected "0"
expecting relationship