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Remove match arm pattern vector to single pattern #4297

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Remove match arm pattern vector to single pattern #4297

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@lucasly-ba lucasly-ba commented Nov 20, 2025 •
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This patch refactors all uses of vector patterns since a vector of patterns would be considered as an alt pattern, a vector is considered useless.

@lucasly-ba
gccrs: remove match arm pattern vector to single pattern
06ad817 
This patch refactors all uses of vector patterns since a vector of
patterns would be considered as an alt pattern, a vector is considered
useless.

gcc/rust/ChangeLog:

	* ast/rust-ast-builder.cc (Builder::match_arm): Moves the vector of patterns
	to a single pattern.
	* ast/rust-ast-collector.cc (TokenCollector::visit):Likewise.
	* ast/rust-ast-pointer-visitor.cc (PointerVisitor::visit):Likewise.
	* ast/rust-ast-visitor.cc (DefaultASTVisitor::visit):Likewise.
	* ast/rust-ast.cc (IfLetExpr::as_string):Likewise.
	(WhileLetLoopExpr::as_string):Likewise.
	(MatchArm::as_string):Likewise.
	* ast/rust-desugar-question-mark.cc (make_match_arm):Likewise.
	* ast/rust-desugar-while-let.cc (DesugarWhileLet::desugar):Likewise.
	* ast/rust-expr.h (class WhileLetLoopExpr):Likewise.
	(class IfLetExpr):Likewise.
	* backend/rust-compile-expr.cc (CompileExpr::visit):Likewise.
	* checks/errors/rust-hir-pattern-analysis.cc (lower_arm):Likewise.
	* expand/rust-cfg-strip.cc (CfgStrip::visit):Likewise.
	* hir/rust-ast-lower.cc (ASTLoweringIfLetBlock::desugar_iflet):Likewise.
	(ASTLoweringExprWithBlock::visit):Likewise.
	* hir/rust-hir-dump.cc (Dump::do_matcharm):Likewise.
	(Dump::visit):Likewise.
	* hir/tree/rust-hir-expr.cc (OperatorExpr::operator=):Likewise.
	(ArithmeticOrLogicalExpr::operator=):Likewise.
	(ComparisonExpr::operator=):Likewise.
	(LazyBooleanExpr::operator=):Likewise.
	(TypeCastExpr::operator=):Likewise.
	(AssignmentExpr::operator=):Likewise.
	(CompoundAssignmentExpr::operator=):Likewise.
	(GroupedExpr::operator=):Likewise.
	(ArrayExpr::operator=):Likewise.
	(ArrayIndexExpr::operator=):Likewise.
	(CallExpr::operator=):Likewise.
	(MethodCallExpr::operator=):Likewise.
	(FieldAccessExpr::operator=):Likewise.
	(BlockExpr::operator=):Likewise.
	(BreakExpr::operator=):Likewise.
	(ReturnExpr::operator=):Likewise.
	(UnsafeBlockExpr::operator=):Likewise.
	(BaseLoopExpr::operator=):Likewise.
	(WhileLetLoopExpr::WhileLetLoopExpr):Likewise.
	(WhileLetLoopExpr::operator=):Likewise.
	(MatchArm::MatchArm):Likewise.
	(MatchArm::operator=):Likewise.
	(MatchExpr::operator=):Likewise.
	* hir/tree/rust-hir-expr.h (class WhileLetLoopExpr):Likewise.
	* hir/tree/rust-hir-visitor.cc (DefaultHIRVisitor::walk):Likewise.
	(DefaultHIRVisitor::visit_match_arm):Likewise.
	* hir/tree/rust-hir.cc (WhileLetLoopExpr::as_string):Likewise.
	(MatchArm::as_string):Likewise.
	* parse/rust-parse-impl.h (Parser::parse_if_let_expr):Likewise.
	(Parser::parse_match_arm):Likewise.
	(Parser::parse_match_arm_patterns):Likewise.
	(Parser::parse_match_arm_pattern):Likewise.
	* parse/rust-parse.h:Likewise.
	* resolve/rust-default-resolver.cc (DefaultResolver::visit_if_let_patterns):Likewise.
	* resolve/rust-late-name-resolver-2.0.cc (Late::visit):Likewise.
	* typecheck/rust-hir-type-check-expr.cc (TypeCheckExpr::visit):Likewise.

Signed-off-by: Lucas Ly Ba <lucas.ly-ba@outlook.com>
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