pest-parser/pest

I have created a grammar for parsing udev rules, but when i pass a bad udev rule (one where the field such as "TYPO" does not fit the grammar), the parser doesn't throw an error unless it is the first condition in the udev_rule. How do i parse it in a way that i know the udev_rule_string was incorrectly formatted/ doesn't fit the grammar?

The Pest Book says Eagerness causes "If an expression fails to match, the failure propagates upwards, eventually leading to a failed parse, unless the failure is "caught" somewhere in the grammar." But I don't see this happening.

Here is the grammar:

WHITESPACE = _{ " " }
udev_rule = { condition ~ ("," ~ condition)* }
condition = ${ field ~ operation ~ quoted_value }
operation = { equality | inequality | assignment }
equality = { "==" }
inequality = { "!=" }
assignment = { "=" }
field = { devpath | kernel | tag | driver | subsystem }
quoted_value = {"\"" ~ value ~ "\""}
value = { (ASCII_ALPHANUMERIC | SPACE_SEPARATOR | "$" | "." | "_" | "*" | "?" | "[" | "]" | "-" | "|" | "\\" | "/" | "%")* } 

// Supported fields
devpath = { "DEVPATH" }
kernel = { "KERNEL" }
tag = { "TAG" }
driver = { "DRIVER" }
subsystem = { "SUBSYSTEM" }

Here is the function for parsing

pub fn parse_udev_rule(udev_rule_string: &str) {
    let udev_rule = UdevRuleParser::parse(Rule::udev_rule, udev_rule_string)?.next().unwrap();
}

Panics on unwrap:
parse_udev_rule("TYPO==\"blah\", KERNEL==\"video[0-9]*\"");
Doesn't panic on unwrap: WHY?
parse_udev_rule("KERNEL==\"video[0-9]*\", TYPO==\"blah\" ");