Bug #21712: Prism and parse.y inconsistency in command call with block and `.()`

• Status: Open
• Assignee: -
• Target version: -
• ruby -v: ruby 4.0.0dev (2025-11-26T06:41:42Z master 43ed35de6c) +YJIT +MN +PRISM [arm64-darwin24]
• Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN

[tompng (tomoya ishida)]

a b do end.() a b do end&.() are parsed differently.
Prism: parse success, parse.y: SyntaxError

I personally like Prism's behavior: .() and &.() are accepted where .f() and &.f() are accepted.