Docs.rs
envconfig-0.5.0
envconfig 0.5.0
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greyblake
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failure ^0.1.2
envconfig_derive ^0.5.0
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envconfig
Function
envconfig
::
load_optional_var
[
−
]
[src]
pub fn load_optional_var<T:
FromStr
>(
var_name: &'static
str
) ->
Result
<
Option
<T>,
Error
>