BUG FIX: Fix RNG assertion thinko reported in #271

NEWS.md

@@ -1,5 +1,8 @@
 # furrr (development version)
 
+* Fixed an issue where generating random seeds could sporadically fail (#271,
+  @HenrikBengtsson).
+
 # furrr 0.3.1
 
 * Redocumented the package with roxygen2 7.2.1 to fix invalid HTML5 issues
@@ -64,15 +67,15 @@
 
 * Updated documentation examples to explicitly set the seed on the workers
   when random numbers are generated (#175).
-  
+
 * Removed an internal call to `future:::supportsMulticore()` since it is no
   longer internal (#174).
 
 # furrr 0.2.0
 
 ## Breaking changes:
 
-* All furrr functions now enforce tidyverse recycling rules (for example, 
+* All furrr functions now enforce tidyverse recycling rules (for example,
   between `.x` and `.y` in `future_map2()`). Previously this was mostly the
   case, except with size zero input. Recycling between input of size 0 and
   input of size >1 no longer recycles to size 0, and is instead an error.
@@ -82,9 +85,9 @@
   Calling `future_options()` will still work, but will trigger a once per
   session warning and will eventually be removed. This change was made to
   free up this function name in case the future package ever wants to use it.
-  
+
 * In a future version of furrr, the `.progress` argument will be deprecated
-  and removed in favor of the 
+  and removed in favor of the
   [progressr](https://CRAN.R-project.org/package=progressr)
   package. The progress bar has not yet been removed in furrr 0.2.0, however
   I would encourage you to please start using progressr if possible. It uses
@@ -139,15 +142,15 @@
 
 * All `*_raw()` variants from purrr have been added, such as
   `future_map_raw()` (#122).
-  
+
 * All furrr functions gained a new argument, `.env_globals`, which determines
   the environment in which globals for `.x` and `...` are
   looked up. It defaults to the caller environment, which is different than
   what was previously used, but should be more correct in some edge cases.
   Most of the time, you should not have to touch this argument. Additionally,
   globals for `.f` are now looked up in the function environment of `.f`
   (HenrikBengtsson/future.apply#62, #153).
-  
+
 * The future specific global option `future.globals.maxSize` now scales with
   the number of elements of `.x` that get exported to each worker. This
   helps prevent some false positives about exporting objects that are too large,
@@ -167,7 +170,7 @@
 
 * `future_invoke_map()` and its variants have been marked as retired to match
   `purrr::invoke_map()`.
-  
+
 * The internals of furrr have been overhauled to unify the implementations of
   `future_map()`, `future_map2()`, `future_pmap()` and all of their variants.
   This should make furrr much easier to maintain going forward (#44).
@@ -182,7 +185,7 @@
 * future >= 1.19.1 is now required to be able to use `future::value()` instead
   of the soon to be deprecated `future::values()` and to access a few bug
   fixes (#108).
-  
+
 * purrr >= 0.3.0 is now required to gain access to various new features and
   breaking changes. For example, `map_if()` gained an `.else` argument, which
   has been added to `future_map_if()`.
@@ -197,16 +200,16 @@ Features:
 
   * `future_pmap_*()` functions have been added to mirror `pmap()`.
 
-  * The `future.*` arguments to each function have been replaced with an 
+  * The `future.*` arguments to each function have been replaced with an
   overarching `.options` argument. Use `future_options()` to create a set of options
-  suitable to be passed to `.options`. This change streamlines the interface 
+  suitable to be passed to `.options`. This change streamlines the interface
   greatly, and simplifies documentation (#8, @hadley).
-  
+
   * `future_invoke_map_*()` functions have been added to mirror `invoke_map()`.
-  
+
   * More documentation and examples have been added.
-  
-  * Added the ability to use a progress bar with `.progress = TRUE` for 
+
+  * Added the ability to use a progress bar with `.progress = TRUE` for
   multicore, multiprocess, and multisession `plan()`s.
 
 Bug Fixes:
@@ -217,4 +220,4 @@ Bug Fixes:
 
 # furrr 0.0.0
 
-* Original GitHub release of `furrr` on 2018-04-13. 
+* Original GitHub release of `furrr` on 2018-04-13.

R/seed.R

@@ -67,7 +67,7 @@ next_random_seed <- function(seed = get_random_seed()) {
   sample.int(n = 1L, size = 1L, replace = FALSE)
   seed_next <- get_random_seed()
 
-  stopifnot(!any(seed_next != seed))
+  stopifnot(identical(seed_next, seed))
 
   invisible(seed_next)
 }