[PATCH 3/4] docs: spec: remove assignment as expression

[ricardo_kagawa@disroot.org]

From: Ricardo Kagawa <ricardo_kagawa@disroot.org>

This commit prevents the use of assignments as expressions, to prevent
chained assignments and the use of assignments inside potential future
 `if`, `while` and other statements. However, assignments are still
valid statements.

Signed-off-by: Ricardo Kagawa <ricardo_kagawa@disroot.org>
---
 docs/pages/language-specification.md | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/docs/pages/language-specification.md b/docs/pages/language-specification.md
index 8d8544a..724ed67 100644
--- a/docs/pages/language-specification.md
+++ b/docs/pages/language-specification.md
@@ -45,11 +45,8 @@ language.
 
 (* Statements *)
 <end-of-statement>    ::= ';' | <line-break>
-<common-statement>    ::= <variable-definition> | <assignment-expression>
-
-(* Expressions *)
-<expression>            ::= <integer-literal> | <variable-name>
-<assignment-expression> ::= <variable-name> <ows> <assignment-operator> <ows> <expression>
+<common-statement>    ::= <variable-definition> | <constant-definition> | <assignment>
+<assignment>          ::= <variable-name> <ows> <assignment-operator> <ows> <expression>
 <assignment-operator> ::= '='
                         | '*='
                         | '/='
@@ -62,6 +59,9 @@ language.
                         | '^='
                         | '|='
 
+(* Expressions *)
+<expression>          ::= <integer-literal> | <variable-name>
+
 (* Identifiers *)
 <type>                ::= 'u32'
 <identifier>          ::= (<alpha> | '_') (<alpha> | <digit> | '_')*
-- 
2.44.0