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135yshr merged 2 commits into from
Sep 29, 2026
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馃摑 docs: Drop the reassignment section the language never had #167

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bdec039
馃摑 docs: Drop the reassignment section the language never had
claude Sep 28, 2026
f26e793
馃摑 docs: Keep the implicit declaration form in the VarStmt grammar
claude Sep 28, 2026
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19 changes: 9 additions & 10 deletions docs/spec.md
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Original file line number Diff line number Diff line change
Expand Up @@ -458,16 +458,23 @@ peek(n) {
### Variable Declaration

```ebnf
VarStmt = "nyan" identifier [ TypeExpr ] "=" Expr newline .
VarStmt = "nyan" identifier [ TypeExpr ] "=" Expr newline
| identifier "=" Expr newline .
```

Declares a variable and binds it to a value.
Declares a variable and binds it to a value. The `nyan` keyword may be left
out when the name has no type annotation, so `x = 42` declares `x` just as
`nyan x = 42` does.

```meow
nyan x int = 42
nyan name = "Nyantyu"
count = 3
```

A binding cannot be rebound. Writing `x = ...` for a name already bound in the
same scope or an enclosing one is a compile error, not a reassignment.

A binding written at the top level of the program belongs to the whole program,
so a function can read it even when the function is written above it. Its value
exists only once its line has run, though, and a function called before then
Expand All @@ -487,14 +494,6 @@ That failure is a Furball like any other, so `~>` can catch it. A name that is
bound nowhere at all is refused before the program runs, as an undefined
variable.

### Reassignment

```ebnf
AssignStmt = identifier "=" Expr newline .
```

Rebinds an existing variable to a new value.

### Function Declaration
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```ebnf
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19 changes: 9 additions & 10 deletions website/content/doc/spec.md
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Expand Up @@ -462,16 +462,23 @@ peek(n) {
### Variable Declaration

```ebnf
VarStmt = "nyan" identifier [ TypeExpr ] "=" Expr newline .
VarStmt = "nyan" identifier [ TypeExpr ] "=" Expr newline
| identifier "=" Expr newline .
```

Declares a variable and binds it to a value.
Declares a variable and binds it to a value. The `nyan` keyword may be left
out when the name has no type annotation, so `x = 42` declares `x` just as
`nyan x = 42` does.

```meow
nyan x int = 42
nyan name = "Nyantyu"
count = 3
```

A binding cannot be rebound. Writing `x = ...` for a name already bound in the
same scope or an enclosing one is a compile error, not a reassignment.

A binding written at the top level of the program belongs to the whole program,
so a function can read it even when the function is written above it. Its value
exists only once its line has run, though, and a function called before then
Expand All @@ -491,14 +498,6 @@ That failure is a Furball like any other, so `~>` can catch it. A name that is
bound nowhere at all is refused before the program runs, as an undefined
variable.

### Reassignment

```ebnf
AssignStmt = identifier "=" Expr newline .
```

Rebinds an existing variable to a new value.

### Function Declaration

```ebnf
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