Rename "NULL" to "NONE"

12 files changed, 24 insertions, 24 deletions

diff --git a/docs/arrays.md b/docs/arrays.md
index b69ae259..c1886d43 100644
--- a/docs/arrays.md
+++ b/docs/arrays.md
@@ -366,7 +366,7 @@ The index of the first occurrence or `!Int` if not found.
 = 2 : Int?
 
 >> [10, 20, 30, 40, 50]:find(9999)
-= NULL : Int?
+= NONE : Int?
 ```
 
 ---
@@ -396,7 +396,7 @@ item matches.
 >> [4, 5, 6]:find(func(i:&Int): i:is_prime())
 = 5 : Int?
 >> [4, 6, 8]:find(func(i:&Int): i:is_prime())
-= NULL : Int?
+= NONE : Int?
 ```
 
 ---
diff --git a/docs/booleans.md b/docs/booleans.md
index 3537e3ee..d2a22d5c 100644
--- a/docs/booleans.md
+++ b/docs/booleans.md
@@ -33,5 +33,5 @@ func parse(text: Text -> Bool?)
 >> Bool.parse("no")
 = no : Bool?
 >> Bool.parse("???")
-= NULL : Bool?
+= NONE : Bool?
 ```
diff --git a/docs/integers.md b/docs/integers.md
index d995d139..213aa1bd 100644
--- a/docs/integers.md
+++ b/docs/integers.md
@@ -171,7 +171,7 @@ func parse(text: Text -> Int?)
 **Returns:**  
 The integer represented by the text. If the given text contains a value outside
 of the representable range or if the entire text can't be parsed as an integer,
-`NULL` will be returned.
+`NONE` will be returned.
 
 **Example:**  
 ```tomo
@@ -182,11 +182,11 @@ of the representable range or if the entire text can't be parsed as an integer,
 
 # Can't parse:
 >> Int.parse("asdf")
-= NULL : Int?
+= NONE : Int?
 
 # Outside valid range:
 >> Int8.parse("9999999")
-= NULL : Int8?
+= NONE : Int8?
 ```
 
 ---
diff --git a/docs/iterators.md b/docs/iterators.md
index ee777cfe..064af9c2 100644
--- a/docs/iterators.md
+++ b/docs/iterators.md
@@ -22,7 +22,7 @@ successively gets one line from a file at a time until the file is exhausted:
 >> iter()
 = "line three" : Text?
 >> iter()
-= NULL : Text?
+= NONE : Text?
 
 for line in (./test.txt):each_line():
     pass
diff --git a/docs/metamethods.md b/docs/metamethods.md
index ca2ecccd..a3f73b54 100644
--- a/docs/metamethods.md
+++ b/docs/metamethods.md
@@ -6,7 +6,7 @@ behavior that is required for all types:
 - `func as_text(obj:&T?, colorize=no, type:&TypeInfo_t -> Text)`: a method to
   convert the type to a string. If `colorize` is `yes`, then the method should
   include ANSI escape codes for syntax highlighting. If the `obj` pointer is
-  `NULL`, a string representation of the type will be returned instead.
+  `NONE`, a string representation of the type will be returned instead.
 
 - `func compare(x:&T, y:&T, type:&TypeInfo_t -> Int32)`: Return an integer representing
   the result of comparing `x` and `y`, where negative numbers mean `x` is less
diff --git a/docs/moments.md b/docs/moments.md
index 6e2ac234..84b71d08 100644
--- a/docs/moments.md
+++ b/docs/moments.md
@@ -523,7 +523,7 @@ Returns a `Moment` object representing the current date and time.
 
 **Description:**  
 Return a new `Moment` object parsed from the given string in the given format,
-or `NULL` if the value could not be successfully parsed.
+or `NONE` if the value could not be successfully parsed.
 
 **Signature:**  
 ```tomo
@@ -539,7 +539,7 @@ func parse(text: Text, format: Text = "%Y-%m-%dT%H:%M:%S%z" -> Moment?)
 
 **Returns:**
 If the text was successfully parsed according to the given format, return a
-`Moment` representing that information. Otherwise, return `NULL`.
+`Moment` representing that information. Otherwise, return `NONE`.
 
 **Example:**  
 ```tomo
diff --git a/docs/nums.md b/docs/nums.md
index 0b55f71e..acf195d8 100644
--- a/docs/nums.md
+++ b/docs/nums.md
@@ -583,7 +583,7 @@ func parse(text: Text -> Num?)
 - `text`: The text containing the number.
 
 **Returns:**
-The number represented by the text or `NULL` if the entire text can't be parsed
+The number represented by the text or `NONE` if the entire text can't be parsed
 as a number.
 
 **Example:**
diff --git a/docs/optionals.md b/docs/optionals.md
index bb2aecfd..584625fe 100644
--- a/docs/optionals.md
+++ b/docs/optionals.md
@@ -63,7 +63,7 @@ x = !Int
 
 ## Type Inference
 
-For convenience, null values can also be written as `NULL` for any type in
+For convenience, null values can also be written as `NONE` for any type in
 situations where the compiler knows what type of optional value is expected:
 
 - When assigning to a variable that has already been declared as optional.
@@ -74,12 +74,12 @@ Here are some examples:
 
 ```tomo
 x := 5?
-x = NULL
+x = NONE
 
 func doop(arg:Int?)->Text?:
-    return NULL
+    return NONE
 
-doop(NULL)
+doop(NONE)
 ```
 
 Non-null values can also be automatically promoted to optional values without
diff --git a/docs/paths.md b/docs/paths.md
index b2dfe384..f2b44522 100644
--- a/docs/paths.md
+++ b/docs/paths.md
@@ -495,7 +495,7 @@ raised.
 = "Hello" : Text?
 
 >> (./nosuchfile.xxx):read()
-= NULL : Text?
+= NONE : Text?
 ```
 ---
 
@@ -524,7 +524,7 @@ returned.
 = [72[B], 101[B], 108[B], 108[B], 111[B]] : [Byte]?
 
 >> (./nosuchfile.xxx):read()
-= NULL : [Byte]?
+= NONE : [Byte]?
 ```
 
 ---
diff --git a/docs/reductions.md b/docs/reductions.md
index 2ed6879f..d68b3886 100644
--- a/docs/reductions.md
+++ b/docs/reductions.md
@@ -22,7 +22,7 @@ nums := [:Int]
 sum := (+: nums)
 
 >> sum
-= NULL : Int?
+= NONE : Int?
 
 >> sum or 0
 = 0
diff --git a/docs/tables.md b/docs/tables.md
index 6a6c7004..6cbe859c 100644
--- a/docs/tables.md
+++ b/docs/tables.md
@@ -50,7 +50,7 @@ was found or error if it wasn't:
 >> t:get("x")
 = 1 : Int?
 >> t:get("????")
-= NULL : Int?
+= NONE : Int?
 >> t:get("x")!
 = 1
 ```
@@ -190,7 +190,7 @@ The value associated with the key or null if the key is not found.
 = 1 : Int?
 
 >> t:get("????")
-= NULL : Int?
+= NONE : Int?
 
 >> t:get("A")!
 = 1 : Int
diff --git a/docs/text.md b/docs/text.md
index 15b08d9c..d67f0a7b 100644
--- a/docs/text.md
+++ b/docs/text.md
@@ -3,7 +3,7 @@
 `Text` is Tomo's datatype to represent text. The name `Text` is used instead of
 "string" because Tomo text represents immutable, normalized unicode data with
 fast indexing that has an implementation that is efficient for concatenation.
-These are _not_ C-style NULL-terminated character arrays. GNU libunistring is
+These are _not_ C-style NUL-terminated character arrays. GNU libunistring is
 used for full Unicode functionality (grapheme cluster counts, capitalization,
 etc.).
 
@@ -695,9 +695,9 @@ containing information about the match.
 **Example:**  
 ```tomo
 >> " #one   #two  #three   ":find($/#{id}/, start=-999)
-= NULL : Match?
+= NONE : Match?
 >> " #one   #two  #three   ":find($/#{id}/, start=999)
-= NULL : Match?
+= NONE : Match?
 >> " #one   #two  #three   ":find($/#{id}/)
 = Match(text="#one", index=2, captures=["one"]) : Match?
 >> " #one   #two  #three   ":find("{id}", start=6)
@@ -887,7 +887,7 @@ or a null value otherwise.
 **Example:**  
 ```tomo
 >> "hello world":matches($/{id}/)
-= NULL : [Text]?
+= NONE : [Text]?
 
 >> "hello world":matches($/{id} {id}/)
 = ["hello", "world"] : [Text]?