From: "andrykonchin (Andrew Konchin) via ruby-core" Date: 2022-12-27T12:22:13+00:00 Subject: [ruby-core:111451] [Ruby master Bug#19269] Constant lookup and #instance_eval Issue #19269 has been reported by andrykonchin (Andrew Konchin). ---------------------------------------- Bug #19269: Constant lookup and #instance_eval https://bugs.ruby-lang.org/issues/19269 * Author: andrykonchin (Andrew Konchin) * Status: Open * Priority: Normal * ruby -v: 3.1.3 * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- I've noticed a confusing behaviour of `#instance_eval` (and `#instance_exec` as well). In some cases it doesn't see constants defined in the object class. Examples: ```ruby C = 1 class A C = 2 end ``` When `#instance_eval` is called with a String - `A::C` constant is visible, that is pretty expected: ```ruby A.new.instance_eval("C") # => 2 ``` But when it's called with a block - `A::C` isn't visible: ```ruby A.new.instance_eval { C } # => 1 ``` If we define a method that returns a constant (defined in the class), then `A::C` is visible in both cases: ```ruby C = 1 class A C = 2 def c; C; end end A.new.instance_eval("c") # => 2 A.new.instance_eval { c } # => 2 ``` So we see that when `#instance_eval` called with a block and a constant is assessed directly is the only case when a class constant isn't visible. Wondering whether it's an expected behaviour and the reason to behave this way. -- https://bugs.ruby-lang.org/ ______________________________________________ ruby-core mailing list -- ruby-core@ml.ruby-lang.org To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org ruby-core info -- https://ml.ruby-lang.org/mailman3/postorius/lists/ruby-core.ml.ruby-lang.org/