continue // Not covering this file.
			}

			var sourceFile string
			var coverFile string
			var key string
			if base, found := strings.CutSuffix(file, ".cgo1.go"); found {
				// cgo files have absolute paths
				base = filepath.Base(base)
				sourceFile = file
				coverFile = objdir + base + ".cgo1.go"
				key = base + ".go"
			} else {
				sourceFile = filepath.Join(p.Dir, file)
				coverFile = objdir + file

declarations that declare packages whose contents it wishes to use,
followed by a possibly empty set of declarations of functions,
types, variables, and constants.
</p>

<pre class="ebnf">
SourceFile       = PackageClause ";" { ImportDecl ";" } { TopLevelDecl ";" } .
</pre>

<h3 id="Package_clause">Package clause</h3>

<p>
A package clause begins each source file and defines the package