allow var in TupleDeconstructionStatement before 0.5.0 (#840)

.changeset/wet-tigers-collect.md

@@ -0,0 +1,5 @@
+---
+"@nomicfoundation/slang": patch
+---
+
+allow `var` in `TupleDeconstructionStatement` before `0.5.0`

crates/solidity/inputs/language/src/definition.rs

@@ -2789,6 +2789,8 @@ codegen_language_macros::compile!(Language(
                                     FieldDelimiters(open = open_paren, close = close_paren)
                             ),
                             fields = (
+                                var_keyword =
+                                    Optional(reference = VarKeyword, enabled = Till("0.5.0")),
                                 open_paren = Required(OpenParen),
                                 elements = Required(TupleDeconstructionElements),
                                 close_paren = Required(CloseParen),

crates/solidity/testing/snapshots/cst_output/TupleDeconstructionStatement/with_var/generated/0.4.11-success.yml

@@ -0,0 +1,30 @@
+# This file is generated automatically by infrastructure scripts. Please don't edit by hand.
+
+Source: >
+  1  │ // "var" should be disabled in "0.5.0":                                          │ 0..39
+  2  │ var (foo, bar) = rhs;                                                            │ 40..61
+
+Errors: []
+
+Tree:
+  - (TupleDeconstructionStatement): # '// "var" should be disabled in "0.5.0":\nvar (foo, ...' (0..62)
+      - (LeadingTrivia): # '// "var" should be disabled in "0.5.0":\n' (0..40)
+          - (SingleLineComment): '// "var" should be disabled in "0.5.0":' # (0..39)
+          - (EndOfLine): "\n" # (39..40)
+      - (var_keyword꞉ VarKeyword): "var" # (40..43)
+      - (LeadingTrivia) ► (Whitespace): " " # (43..44)
+      - (open_paren꞉ OpenParen): "(" # (44..45)
+      - (elements꞉ TupleDeconstructionElements): # "foo, bar" (45..53)
+          - (item꞉ TupleDeconstructionElement) ► (member꞉ TupleMember) ► (variant꞉ UntypedTupleMember) ► (name꞉ Identifier): "foo" # (45..48)
+          - (separator꞉ Comma): "," # (48..49)
+          - (item꞉ TupleDeconstructionElement) ► (member꞉ TupleMember) ► (variant꞉ UntypedTupleMember): # " bar" (49..53)
+              - (LeadingTrivia) ► (Whitespace): " " # (49..50)
+              - (name꞉ Identifier): "bar" # (50..53)
+      - (close_paren꞉ CloseParen): ")" # (53..54)
+      - (LeadingTrivia) ► (Whitespace): " " # (54..55)
+      - (equal꞉ Equal): "=" # (55..56)
+      - (expression꞉ Expression): # " rhs" (56..60)
+          - (LeadingTrivia) ► (Whitespace): " " # (56..57)
+          - (variant꞉ Identifier): "rhs" # (57..60)
+      - (semicolon꞉ Semicolon): ";" # (60..61)
+      - (TrailingTrivia) ► (EndOfLine): "\n" # (61..62)

crates/solidity/testing/snapshots/cst_output/TupleDeconstructionStatement/with_var/generated/0.5.0-failure.yml

@@ -0,0 +1,19 @@
+# This file is generated automatically by infrastructure scripts. Please don't edit by hand.
+
+Source: >
+  1  │ // "var" should be disabled in "0.5.0":                                          │ 0..39
+  2  │ var (foo, bar) = rhs;                                                            │ 40..61
+
+Errors: # 1 total
+  - >
+    Error: Expected OpenParen.
+       ╭─[crates/solidity/testing/snapshots/cst_output/TupleDeconstructionStatement/with_var/input.sol:1:1]
+       │
+     1 │ ╭─▶ // "var" should be disabled in "0.5.0":
+     2 │ ├─▶ var (foo, bar) = rhs;
+       │ │                           
+       │ ╰─────────────────────────── Error occurred here.
+    ───╯
+
+Tree:
+  - (SKIPPED): '// "var" should be disabled in "0.5.0":\nvar (foo, ...' # (0..62)

crates/solidity/testing/snapshots/cst_output/TupleDeconstructionStatement/with_var/input.sol

@@ -0,0 +1,2 @@
+// "var" should be disabled in "0.5.0":
+var (foo, bar) = rhs;