Packages
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A walkthrough of Go packages as defined in the Go language specification (go1.23). Covers how packages are constructed from source files, the structure of a source file (PackageClause, import declarations, top-level declarations), and what can legally appear before the package clause: GoDoc comments, build constraints/directives, and even shebang lines. Also explains why the spec doesn't strictly require all package files to reside in the same directory, with practical examples like test builds and the Go playground.
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