Evaling ((fn [do] do) 1) returns nil while ((fn [do] do do) 1) returns 1

Question

user=> ((fn (link: do) do) 1)
nil

user=> ((fn (link: do) (do do)) 1)
1

user=> ((fn (link: ) do))
nil

user=> ((fn (link: ) do do))
CompilerException java.lang.RuntimeException: Unable to resolve symbol: do in this context, compiling:(NO_SOURCE_PATH:0:0)

Answer 1

Comment made by: bronsa

This patch creates a DoExpr class and makes DoExpr.Parser the DO special form parser.

DoExpr.Parser simply removes the 'do' symbol and delegates to BodyExpr, that was previously done by BodyExpr incorrectly.

Answer 2

Reference: https://clojure.atlassian.net/browse/CLJ-1216 (reported by bronsa)