1 files changed, 5 insertions, 2 deletions
diff --git a/decl.c b/decl.c
index 11f7c12..cca767a 100644
--- a/decl.c
+++ b/decl.c
@@ -870,6 +870,7 @@ decl(struct scope *s, struct func *f)
 	int allowfunc = !f;
 	struct decl *d, *prior;
 	enum declkind kind;
+	struct expr *e;
 	uint64_t c;
 	int align;
 
@@ -877,9 +878,11 @@ decl(struct scope *s, struct func *f)
 		expect(TLPAREN, "after _Static_assert");
 		c = intconstexpr(s, true);
 		expect(TCOMMA, "after static assertion expression");
-		expect(TSTRINGLIT, "after static assertion expression");
+		e = assignexpr(s);
+		if (!e->decayed || e->base->kind != EXPRSTRING)
+			error(&tok.loc, "expected string literal after static assertion expression");
 		if (!c)
-			error(&tok.loc, "static assertion failed");  // XXX: add string here
+			error(&tok.loc, "static assertion failed: %.*s", (int)e->base->string.size, e->base->string.data);
 		expect(TRPAREN, "after static assertion message");
 		expect(TSEMICOLON, "after static assertion");
 		return true;