Influences

Several concepts and facilities were adopted from or influenced by other languages:

From Ada

• strict name equivalence
• the distinction of alias types and derived types
• the general idea of allowing digit separators in number literals

From C

• number literals
• CONST parameters
• the ++ and -- notation, but only in statements
• the general idea of records with an indeterminate array field, but type safe

From Fortran

• single line comments using prefix !

From Mesa

• the general idea of a stigmatising naming convention for unsafe facilities

From ISO Modula-2

• the CAST function
• pragma delimiters <* and *>

From Oberon

• extensible record types

From Ojective-C

• support for reference counted types

From Pascal

• functions PRED and SUCC
• the general idea of built-in READ and WRITE syntax
• the concept of storing the length/value-count of a string/array within the string/array itself

From Python

• the general idea of array slicing
• array indexing relative to last index

Of unknown Origin

Some adopted features are common in many other languages and are not easily traceable to their origin

• zero-based array indexing
• structured value constructors
• for-each loop instead of for-to-by loop