[c] Free temporary string storage as interpolated string arg.

#26

GenC.fu

@@ -106,7 +106,7 @@ public class GenC : GenCCpp
 			expr.Accept(this, FuPriority.Primary);
 		}
 		else
-			expr.Accept(this, FuPriority.Argument);
+			WriteTemporaryOrExpr(expr, FuPriority.Argument);
 	}
 
 	void WriteStringPtrAddCast!(FuCallExpr call)
@@ -910,8 +910,11 @@ public class GenC : GenCCpp
 		case FuLambdaExpr _:
 			break;
 		case FuInterpolatedString interp:
-			foreach (FuInterpolatedPart part in interp.Parts)
+			foreach (FuInterpolatedPart part in interp.Parts) {
 				WriteCTemporaries(part.Argument);
+				if (IsStringSubstring(part.Argument) == null)
+					WriteStorageTemporary(part.Argument);
+			}
 			break;
 		case FuSymbolReference symbol:
 			if (symbol.Left != null)

libfut.cpp

@@ -8751,7 +8751,7 @@ void GenC::writeInterpolatedStringArgBase(const FuExpr * expr)
 		expr->accept(this, FuPriority::primary);
 	}
 	else
-		expr->accept(this, FuPriority::argument);
+		writeTemporaryOrExpr(expr, FuPriority::argument);
 }
 
 void GenC::writeStringPtrAddCast(const FuCallExpr * call)
@@ -9485,8 +9485,11 @@ void GenC::writeCTemporaries(const FuExpr * expr)
 	else if (dynamic_cast<const FuLiteral *>(expr) || dynamic_cast<const FuLambdaExpr *>(expr)) {
 	}
 	else if (const FuInterpolatedString *interp = dynamic_cast<const FuInterpolatedString *>(expr))
-		for (const FuInterpolatedPart &part : interp->parts)
+		for (const FuInterpolatedPart &part : interp->parts) {
 			writeCTemporaries(part.argument.get());
+			if (isStringSubstring(part.argument.get()) == nullptr)
+				writeStorageTemporary(part.argument.get());
+		}
 	else if (const FuSymbolReference *symbol = dynamic_cast<const FuSymbolReference *>(expr)) {
 		if (symbol->left != nullptr)
 			writeCTemporaries(symbol->left.get());

libfut.cs

@@ -8999,7 +8999,7 @@ protected virtual void WriteInterpolatedStringArgBase(FuExpr expr)
 				expr.Accept(this, FuPriority.Primary);
 			}
 			else
-				expr.Accept(this, FuPriority.Argument);
+				WriteTemporaryOrExpr(expr, FuPriority.Argument);
 		}
 
 		void WriteStringPtrAddCast(FuCallExpr call)
@@ -9793,8 +9793,11 @@ void WriteCTemporaries(FuExpr expr)
 			case FuLambdaExpr _:
 				break;
 			case FuInterpolatedString interp:
-				foreach (FuInterpolatedPart part in interp.Parts)
+				foreach (FuInterpolatedPart part in interp.Parts) {
 					WriteCTemporaries(part.Argument);
+					if (IsStringSubstring(part.Argument) == null)
+						WriteStorageTemporary(part.Argument);
+				}
 				break;
 			case FuSymbolReference symbol:
 				if (symbol.Left != null)

libfut.js

@@ -9307,7 +9307,7 @@ export class GenC extends GenCCpp
 			expr.accept(this, FuPriority.PRIMARY);
 		}
 		else
-			expr.accept(this, FuPriority.ARGUMENT);
+			this.#writeTemporaryOrExpr(expr, FuPriority.ARGUMENT);
 	}
 
 	#writeStringPtrAddCast(call)
@@ -10116,8 +10116,11 @@ export class GenC extends GenCCpp
 		}
 		else if (expr instanceof FuInterpolatedString) {
 			const interp = expr;
-			for (const part of interp.parts)
+			for (const part of interp.parts) {
 				this.#writeCTemporaries(part.argument);
+				if (GenC.isStringSubstring(part.argument) == null)
+					this.#writeStorageTemporary(part.argument);
+			}
 		}
 		else if (expr instanceof FuSymbolReference) {
 			const symbol = expr;

test/StringInterpolatedTemporary.fu

@@ -1,14 +1,17 @@
 public static class Test
 {
+	static string() Produce(int i) => $"{i}"; //FAIL: cl
+
 	static bool Accept(string s) => s == "42";
 
 	public static bool Run()
 	{
 		int i = 42;
-		Accept($"{i}"); //FAIL: cl
+		Accept($"{i}");
 		bool b = Accept($"{i}");
 		if (!b)
 			return false;
+		Accept($"{Produce(i)}");
 		return Accept($"{i}");
 	}
 }