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Line 37: An important property of k syntax is it's ''static parsability'' - a parse tree can be built just by looking at the source code, without any knowledge of the values variables have at runtime. Note that a k expression could have the syntactic role of a <tt><noun></tt> in the source code ~~but~~and evaluate to a function at runtime, for instance <tt>{1+x}</tt> or <tt>(+)</tt>. A bare <tt>+</tt> would be a verb, but enclosing anything in parentheses marks it as a noun - this is called ''nominalization'' ("turning into a noun").

Grammar (edit)