Blocks
A block is a possibly empty sequence of statements within matching braces ({}).
Block = "{" StatementList "}" .
StatementList = { Statement } .
In addition to explicit blocks in the source code, there are implicit blocks:
- The universe block encompasses all Flux source text.
- Each package has a package block containing all Flux source text for that package.
- Each file has a file block containing all Flux source text in that file.
- Each function literal has its own function block even if not explicitly declared.
Blocks nest and influence scoping.
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