[src/trunk]: src/tests/usr.bin/xlint/lint1 tests/lint: demonstrate bug in cha...

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/ae96ad763831
branches:  trunk
changeset: 984865:ae96ad763831
user:      rillig <rillig%NetBSD.org@localhost>
date:      Mon Jul 26 17:09:46 2021 +0000

description:
tests/lint: demonstrate bug in chained assignment (since 2021-07-15)

Since cgram.y 1.325 from 2021-07-15, lint has been parsing assignment
expressions correctly.  It got the associativity wrong.

diffstat:

 tests/usr.bin/xlint/lint1/expr_precedence.c   |  14 +++++++++++++-
 tests/usr.bin/xlint/lint1/expr_precedence.exp |   1 +
 2 files changed, 14 insertions(+), 1 deletions(-)

diffs (33 lines):

diff -r a639747bebab -r ae96ad763831 tests/usr.bin/xlint/lint1/expr_precedence.c
--- a/tests/usr.bin/xlint/lint1/expr_precedence.c       Mon Jul 26 16:45:56 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/expr_precedence.c       Mon Jul 26 17:09:46 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: expr_precedence.c,v 1.3 2021/07/15 17:48:10 rillig Exp $       */
+/*     $NetBSD: expr_precedence.c,v 1.4 2021/07/26 17:09:46 rillig Exp $       */
 # 3 "expr_precedence.c"
 
 /*
@@ -36,3 +36,15 @@
     /* Syntactically ok, must be a constant expression though. */
     var > 0 ? 2 : 1)))
 my_printf(const char *, ...);
+
+void
+assignment_associativity(int arg)
+{
+       int left, right;
+
+       /* FIXME */
+       /* expect+1: error: left operand of '=' must be lvalue [114] */
+       left = right = arg;
+
+       left = arg;
+}
diff -r a639747bebab -r ae96ad763831 tests/usr.bin/xlint/lint1/expr_precedence.exp
--- a/tests/usr.bin/xlint/lint1/expr_precedence.exp     Mon Jul 26 16:45:56 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/expr_precedence.exp     Mon Jul 26 17:09:46 2021 +0000
@@ -2,3 +2,4 @@
 expr_precedence.c(18): error: non-constant initializer [177]
 expr_precedence.c(35): error: 'var' undefined [99]
 expr_precedence.c(35): error: syntax error '=' [249]
+expr_precedence.c(47): error: left operand of '=' must be lvalue [114]