The "Unknown:"s below indicate that an entry is incomplete.

• either the entry exist in the language, and please tell.
• either the entry doesn't exist in the language, and please tell so. The entry will be marked as such and won't appear as missing anymore.

• Various

  do ... end(1)	block (grouping statements, especially when statements are not expressions)
  /* ... */	commenting (non nestable)
  case-insensitive	tokens (case-sensitivity (keywords, variable identifiers...))
  [a-zA-Z][a-zA-Z0-9]*	tokens (variable identifier regexp)

• Control Flow

  select (val); when (v1) statement1; when (v2, v3) statement23; otherwise statement_else; end;	multiple selection (switch)
  ;	sequence

• Strings

  ||	string concatenation

• Booleans

  ~	logical not
  ^	logical not

• Mathematics

  **	exponentiation (power)

Remarks

• (1) introduce scope