Result::or : avoid over-specializing the type #22817
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Changes .or() so that it can return a Result with a different E type
than the one it is called on.
Essentially:
fn or(self, res: Result<T, E>) -> Result<T, E>
becomes
fn or<F>(self, res: Result<T, F>) -> Result<T, F>
This brings `or` in line with the existing `and` and `or_else` member
types.
This is a
[breaking-change]
Due to some code needing additional type annotations.
|
r? @huonw (rust_highfive has picked a reviewer for you, use r? to override) |
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@bors r+ 07dc |
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@bors rollup |
steveklabnik
added a commit
to steveklabnik/rust
that referenced
this pull request
Feb 26, 2015
Changes .or() so that it can return a Result with a different E type
than the one it is called on.
Essentially:
fn or(self, res: Result<T, E>) -> Result<T, E>
becomes
fn or<F>(self, res: Result<T, F>) -> Result<T, F>
This brings `or` in line with the existing `and` & `or_else`
This is a
[breaking-change]
Due to some code needing additional type annotations.
Manishearth
added a commit
to Manishearth/rust
that referenced
this pull request
Feb 27, 2015
Changes .or() so that it can return a Result with a different E type
than the one it is called on.
Essentially:
fn or(self, res: Result<T, E>) -> Result<T, E>
becomes
fn or<F>(self, res: Result<T, F>) -> Result<T, F>
This brings `or` in line with the existing `and` & `or_else`
This is a
[breaking-change]
Due to some code needing additional type annotations.
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Changes .or() so that it can return a Result with a different E type
than the one it is called on.
Essentially:
becomes
This brings
orin line with the existingand&or_elseThis is a
[breaking-change]
Due to some code needing additional type annotations.