EL1
Extensible Language One.
An extensible language by B. Wegbreit of Harvard ca 1974.
EL1 is internally somewhat Lisp-like, but fully typed with records and pointers.
The external syntax is ALGOL-like and extensible, supporting user-defined data structures, control structures and operations.
The parser is table-driven, with a modifiable set of productions.
Used as the basis for the ECL operating system.
["Studies in Extensible Programming Languages", B. Wegbreit, Garland.
Pub 1980].
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