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DOCS: document the strict mode behavior for env variables.

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Jeremy Wall 2018-11-26 21:42:12 -06:00
parent 17a721a600
commit 4305fe0bcd
1 changed files with 4 additions and 2 deletions
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6
docsite/site/content/reference/expressions.md
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@ -53,8 +53,10 @@ tuple."quoted field";
There is a special selector in ucg for obtaining a value from the environment.
The `env` selector references the environment variables in environment at the
time of the build. You reference an environment variable just like it was in a
tuple. Attempting to reference a variable that doesn't exist will be a compile
error.
tuple. By default, attempting to reference a variable that doesn't exist will
be a compile error. You can turn this behavior off with the `--nostrict`
argument to the compiler. When in nostrict mode nonexistent variables will
result in a warning and be set to the NULL empty value.
```
let env_name = env.DEPLOY_ENV;