From: nobu@... Date: 2019-04-12T09:59:44+00:00 Subject: [ruby-core:92256] [Ruby trunk Bug#15708] Implicit numbered argument decomposes an array Issue #15708 has been updated by nobu (Nobuyoshi Nakada). jeremyevans0 (Jeremy Evans) wrote: > Attached is a patch that will turn off destructuring if the only implicit block variable is `@1`: ```diff - args->nd_ainfo->rest_arg = excessed_comma; + if (max_numparam > 1) { + args->nd_ainfo->rest_arg = excessed_comma; + } ``` It can be done by just removing the line, regardless `max_numparam`. ---------------------------------------- Bug #15708: Implicit numbered argument decomposes an array https://bugs.ruby-lang.org/issues/15708#change-77589 * Author: sawa (Tsuyoshi Sawada) * Status: Open * Priority: Normal * Assignee: * Target version: * ruby -v: 2.7.0dev * Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN ---------------------------------------- In the following, `@1` refers to the entire item iterated: ```ruby a = [1, 2, 3] a.map{|x| x} # => [1, 2, 3] a.map{@1} # => [1, 2, 3] ``` whereas in the following, `@1` refers to the first item achieved by decomposing the item iterated, behaving the same as `x` given by `|(x)|` rather than by `|x|`: ```ruby a = [[1], [2], [3]] a.map{|x| x} # => [[1], [2], [3]] a.map{|(x)| x} # => [1, 2, 3] a.map{@1} # => [1, 2, 3] ``` Is this intended? ---Files-------------------------------- single-implicit-arg-no-destructure.diff (471 Bytes) -- https://bugs.ruby-lang.org/ Unsubscribe: