From 6ee55406ec1b463c4163bc1695f383a15af7d80d Mon Sep 17 00:00:00 2001
From: Todd Strader <tstrader@hudson-trading.com>
Date: Fri, 24 Oct 2025 17:33:10 -0400
Subject: [PATCH] Intermediate variables for system calls during expression
 coverage

---
 src/V3Ast.h                                   |  2 +
 src/V3AstNodeExpr.h                           | 53 +++++++++++++++++++
 src/V3Coverage.cpp                            |  7 +--
 .../t/t_sys_file_basic_cover_expr.out         |  1 +
 test_regress/t/t_sys_file_basic_cover_expr.py | 26 +++++++++
 5 files changed, 86 insertions(+), 3 deletions(-)
 create mode 120000 test_regress/t/t_sys_file_basic_cover_expr.out
 create mode 100755 test_regress/t/t_sys_file_basic_cover_expr.py

diff --git a/src/V3Ast.h b/src/V3Ast.h
index a64ead1a1..18183a421 100644
--- a/src/V3Ast.h
+++ b/src/V3Ast.h
@@ -901,6 +901,8 @@ public:
     // isUnlikely handles $stop or similar statement which means an above IF
     // statement is unlikely to be taken
     virtual bool isUnlikely() const { return false; }
+    // Is an IEEE system function (versus internally-generated)
+    virtual bool isSystemFunc() const { return false; }
     virtual int instrCount() const { return 0; }
     // Iff node is identical to another node
     virtual bool isSame(const AstNode* samep) const {
diff --git a/src/V3AstNodeExpr.h b/src/V3AstNodeExpr.h
index 066e2be69..e8448a0bf 100644
--- a/src/V3AstNodeExpr.h
+++ b/src/V3AstNodeExpr.h
@@ -134,6 +134,7 @@ public:
     bool cleanRhs() const override { return false; }
     bool sizeMattersLhs() const override { return false; }
     bool sizeMattersRhs() const override { return false; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return INSTR_COUNT_DBL_TRIG; }
     void numberOperate(V3Number&, const V3Number&, const V3Number&) override { V3ERROR_NA; }
 };
@@ -172,6 +173,7 @@ public:
     bool cleanRhs() const override { return false; }
     bool sizeMattersLhs() const override { return false; }
     bool sizeMattersRhs() const override { return false; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return INSTR_COUNT_DBL_TRIG; }
     bool doubleFlavor() const override { return true; }
 };
@@ -347,6 +349,7 @@ protected:
 
 public:
     ASTGEN_MEMBERS_AstNodeTermop;
+    bool isSystemFunc() const override { return true; }
 };
 class AstNodeTriop VL_NOT_FINAL : public AstNodeExpr {
     // Ternary expression
@@ -403,6 +406,7 @@ public:
     bool sizeMattersLhs() const override { return false; }
     bool sizeMattersRhs() const override { return false; }
     bool sizeMattersThs() const override { return false; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return INSTR_COUNT_DBL_TRIG; }
     void numberOperate(V3Number& out, const V3Number& lhs, const V3Number& rhs,
                        const V3Number& ths) override {
@@ -449,6 +453,7 @@ public:
     bool cleanOut() const override { return true; }
     bool cleanLhs() const override { return false; }
     bool sizeMattersLhs() const override { return false; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return INSTR_COUNT_DBL_TRIG; }
     bool doubleFlavor() const override { return true; }
 };
@@ -1350,6 +1355,7 @@ public:
     int instrCount() const override { return widthInstrs() * 64; }
     bool isPredictOptimizable() const override { return false; }
     bool isPure() override { return false; }  // SPECIAL: $display has 'visual' ordering
+    bool isSystemFunc() const override { return true; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
 };
 class AstFOpen final : public AstNodeExpr {
@@ -1372,6 +1378,7 @@ public:
     bool isOutputter() override { return true; }
     bool isUnlikely() const override { return true; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstFOpenMcd final : public AstNodeExpr {
     // @astgen op2 := filenamep : AstNodeExpr
@@ -1415,6 +1422,7 @@ public:
     bool isOutputter() override { return true; }  // SPECIAL: makes output
     bool cleanOut() const override { return false; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstFRewind final : public AstNodeExpr {
     // @astgen op1 := filep : Optional[AstNode]
@@ -1462,6 +1470,7 @@ public:
     }
     string text() const { return m_text; }  // * = Text to display
     void text(const string& text) { m_text = text; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstFSeek final : public AstNodeExpr {
     // @astgen op1 := filep : AstNode // file (must be a VarRef)
@@ -1484,6 +1493,7 @@ public:
     bool isOutputter() override { return true; }  // SPECIAL: makes output
     bool cleanOut() const override { return false; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstFTell final : public AstNodeExpr {
     // @astgen op1 := filep : AstNode // file (must be a VarRef)
@@ -1503,6 +1513,7 @@ public:
     bool isUnlikely() const override { return true; }
     bool cleanOut() const override { return false; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstFalling final : public AstNodeExpr {
     // Verilog $falling_gclk
@@ -1519,6 +1530,7 @@ public:
     bool cleanOut() const override { V3ERROR_NA_RETURN(""); }
     int instrCount() const override { return widthInstrs(); }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstFell final : public AstNodeExpr {
     // Verilog $fell
@@ -1537,6 +1549,7 @@ public:
     bool cleanOut() const override { V3ERROR_NA_RETURN(""); }
     int instrCount() const override { return widthInstrs(); }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstFuture final : public AstNodeExpr {
     // Verilog $future_gclk
@@ -1555,6 +1568,7 @@ public:
     bool cleanOut() const override { V3ERROR_NA_RETURN(""); }
     int instrCount() const override { return widthInstrs(); }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstGatePin final : public AstNodeExpr {
     // Possibly expand a gate primitive input pin value to match the range of the gate primitive
@@ -1835,6 +1849,7 @@ public:
     bool cleanOut() const override { V3ERROR_NA_RETURN(""); }
     int instrCount() const override { return widthInstrs(); }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstPatMember final : public AstNodeExpr {
     // Verilog '{a} or '{a{b}}
@@ -1923,6 +1938,7 @@ public:
     bool isGateOptimizable() const override { return false; }
     bool isPredictOptimizable() const override { return false; }
     bool isPure() override { return !seedp(); }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return INSTR_COUNT_PLI; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
     bool combinable(const AstRand* samep) const {
@@ -1947,6 +1963,7 @@ public:
     bool cleanOut() const override { return false; }
     bool isGateOptimizable() const override { return false; }
     bool isPredictOptimizable() const override { return false; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return INSTR_COUNT_PLI; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
 };
@@ -1965,6 +1982,7 @@ public:
     bool cleanOut() const override { V3ERROR_NA_RETURN(""); }
     int instrCount() const override { return widthInstrs(); }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstRose final : public AstNodeExpr {
     // Verilog $rose
@@ -1983,6 +2001,7 @@ public:
     bool cleanOut() const override { V3ERROR_NA_RETURN(""); }
     int instrCount() const override { return widthInstrs(); }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstSExpr final : public AstNodeExpr {
     // Sequence expression
@@ -2055,6 +2074,7 @@ public:
     string emitVerilog() override { V3ERROR_NA_RETURN(""); }
     string emitC() override { V3ERROR_NA_RETURN(""); }
     bool cleanOut() const override { V3ERROR_NA_RETURN(true); }
+    bool isSystemFunc() const override { return true; }
 };
 class AstSScanF final : public AstNodeExpr {
     // @astgen op1 := exprsp : List[AstNode] // VarRefs for results
@@ -2086,6 +2106,7 @@ public:
     string text() const { return m_text; }  // * = Text to display
     VTimescale timeunit() const { return m_timeunit; }
     void timeunit(const VTimescale& flag) { m_timeunit = flag; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstSampled final : public AstNodeExpr {
     // Verilog $sampled
@@ -2102,6 +2123,7 @@ public:
     bool cleanOut() const override { V3ERROR_NA_RETURN(""); }
     int instrCount() const override { return 0; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstScopeName final : public AstNodeExpr {
     // For display %m and DPI context imports
@@ -2228,6 +2250,7 @@ public:
     bool cleanOut() const override { V3ERROR_NA_RETURN(""); }
     int instrCount() const override { return widthInstrs(); }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstStackTraceF final : public AstNodeExpr {
     // $stacktrace used as function
@@ -2263,6 +2286,7 @@ public:
     bool cleanOut() const override { V3ERROR_NA_RETURN(""); }
     int instrCount() const override { return widthInstrs(); }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstStructSel final : public AstNodeExpr {
     // Unpacked struct/union member access
@@ -2330,6 +2354,7 @@ public:
     bool isUnlikely() const override { return true; }
     bool cleanOut() const override { return true; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstTestPlusArgs final : public AstNodeExpr {
     // Search expression. If nullptr then this is a $test$plusargs instead of $value$plusargs.
@@ -2346,6 +2371,7 @@ public:
     bool isGateOptimizable() const override { return false; }
     bool isPredictOptimizable() const override { return false; }
     // but isPure() true
+    bool isSystemFunc() const override { return true; }
     bool cleanOut() const override { return true; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
 };
@@ -2380,6 +2406,7 @@ public:
     string emitC() override { V3ERROR_NA_RETURN(""); }
     string emitSimpleOperator() override { V3ERROR_NA_RETURN(""); }
     bool cleanOut() const override { return true; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return widthInstrs(); }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
 };
@@ -2396,6 +2423,7 @@ public:
     string emitC() override { V3ERROR_NA_RETURN(""); }
     string emitSimpleOperator() override { V3ERROR_NA_RETURN(""); }
     bool cleanOut() const override { return true; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return widthInstrs(); }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
     VTimescale timeunit() const { return m_timeunit; }
@@ -2450,6 +2478,7 @@ public:
     bool isGateOptimizable() const override { return false; }
     bool isPredictOptimizable() const override { return false; }
     bool isPure() override { return !outp(); }
+    bool isSystemFunc() const override { return true; }
     bool cleanOut() const override { return true; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
 };
@@ -2553,6 +2582,7 @@ public:
     bool cleanRhs() const override { return true; }
     bool sizeMattersLhs() const override { return false; }
     bool sizeMattersRhs() const override { return false; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return widthInstrs() * 20; }
     bool isPure() override { return false; }
 };
@@ -2731,6 +2761,7 @@ public:
     bool cleanRhs() const override { return true; }
     bool sizeMattersLhs() const override { return false; }
     bool sizeMattersRhs() const override { return false; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return widthInstrs() * 64; }
     AstNode* strgp() const { return lhsp(); }
     AstNode* filep() const { return rhsp(); }
@@ -2751,6 +2782,7 @@ public:
     bool cleanRhs() const override { return true; }
     bool sizeMattersLhs() const override { return false; }
     bool sizeMattersRhs() const override { return false; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return widthInstrs() * 64; }
     bool isPredictOptimizable() const override { return false; }
     bool isPure() override { return false; }  // SPECIAL: $display has 'visual' ordering
@@ -3667,6 +3699,7 @@ public:
     bool isGateOptimizable() const override { return false; }
     bool isPredictOptimizable() const override { return false; }
     bool isPure() override { return false; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return INSTR_COUNT_PLI; }
 };
 
@@ -4452,6 +4485,7 @@ public:
     bool sizeMattersRhs() const override { return false; }
     bool sizeMattersThs() const override { return false; }
     bool sizeMattersFhs() const override { return false; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return widthInstrs() * 16; }
 };
 
@@ -4466,6 +4500,7 @@ public:
     string emitVerilog() override { return "%f$inferred_disable"; }
     string emitC() override { V3ERROR_NA_RETURN(""); }
     bool cleanOut() const override { return true; }
+    bool isSystemFunc() const override { return true; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
 };
 class AstTime final : public AstNodeTermop {
@@ -4482,6 +4517,7 @@ public:
     bool cleanOut() const override { return true; }
     bool isGateOptimizable() const override { return false; }
     bool isPredictOptimizable() const override { return false; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return INSTR_COUNT_TIME; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
     void dump(std::ostream& str = std::cout) const override;
@@ -4503,6 +4539,7 @@ public:
     bool cleanOut() const override { return true; }
     bool isGateOptimizable() const override { return false; }
     bool isPredictOptimizable() const override { return false; }
+    bool isSystemFunc() const override { return true; }
     int instrCount() const override { return INSTR_COUNT_TIME; }
     bool sameNode(const AstNode* /*samep*/) const override { return true; }
     void dump(std::ostream& str = std::cout) const override;
@@ -4795,6 +4832,7 @@ public:
     bool cleanLhs() const override { return false; }  // Eliminated before matters
     bool sizeMattersLhs() const override { return false; }  // Eliminated before matters
     int instrCount() const override { return INSTR_COUNT_DBL; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstCAwait final : public AstNodeUniop {
     // Emit C++'s co_await expression
@@ -4867,6 +4905,7 @@ public:
     bool cleanLhs() const override { return true; }
     bool sizeMattersLhs() const override { return false; }
     int instrCount() const override { return widthInstrs() * 16; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstCastWrap final : public AstNodeUniop {
     // A cast which has been expanded and the LHSP does all the lifting
@@ -4896,6 +4935,7 @@ public:
     bool cleanLhs() const override { return true; }
     bool sizeMattersLhs() const override { return false; }
     int instrCount() const override { return widthInstrs() * 16; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstCvtPackString final : public AstNodeUniop {
     // Convert to Verilator Packed String (aka verilog "string")
@@ -4977,6 +5017,7 @@ public:
     int instrCount() const override { return widthInstrs() * 16; }
     bool isPredictOptimizable() const override { return false; }
     bool isPure() override { return false; }  // SPECIAL: $display has 'visual' ordering
+    bool isSystemFunc() const override { return true; }
     AstNode* filep() const { return lhsp(); }
 };
 class AstFGetC final : public AstNodeUniop {
@@ -4995,6 +5036,7 @@ public:
     bool isPredictOptimizable() const override { return false; }
     bool isPure() override { return false; }  // SPECIAL: $display has 'visual' ordering
     AstNode* filep() const { return lhsp(); }
+    bool isSystemFunc() const override { return true; }
 };
 class AstISToRD final : public AstNodeUniop {
     // $itor where lhs is signed
@@ -5012,6 +5054,7 @@ public:
     bool cleanLhs() const override { return true; }
     bool sizeMattersLhs() const override { return false; }
     int instrCount() const override { return INSTR_COUNT_DBL; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstIToRD final : public AstNodeUniop {
     // $itor where lhs is unsigned
@@ -5028,6 +5071,7 @@ public:
     bool cleanLhs() const override { return true; }
     bool sizeMattersLhs() const override { return false; }
     int instrCount() const override { return INSTR_COUNT_DBL; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstIsUnbounded final : public AstNodeUniop {
     // True if is unbounded ($)
@@ -5046,6 +5090,7 @@ public:
     bool cleanOut() const override { return false; }
     bool cleanLhs() const override { return false; }
     bool sizeMattersLhs() const override { return false; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstIsUnknown final : public AstNodeUniop {
     // True if any unknown bits
@@ -5061,6 +5106,7 @@ public:
     bool cleanOut() const override { return false; }
     bool cleanLhs() const override { return false; }
     bool sizeMattersLhs() const override { return false; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstLenN final : public AstNodeUniop {
     // Length of a string
@@ -5191,6 +5237,7 @@ public:
     bool cleanLhs() const override { return true; }
     bool sizeMattersLhs() const override { return false; }
     int instrCount() const override { return widthInstrs() * 4; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstOneHot0 final : public AstNodeUniop {
     // True if only single bit, or no bits set in vector
@@ -5207,6 +5254,7 @@ public:
     bool cleanLhs() const override { return true; }
     bool sizeMattersLhs() const override { return false; }
     int instrCount() const override { return widthInstrs() * 3; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstRToIRoundS final : public AstNodeUniop {
     // Convert real to integer, with arbitrary sized output (not just "integer" format)
@@ -5225,6 +5273,7 @@ public:
     bool cleanLhs() const override { return false; }
     bool sizeMattersLhs() const override { return false; }
     int instrCount() const override { return INSTR_COUNT_DBL; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstRToIS final : public AstNodeUniop {
     // $rtoi(lhs)
@@ -5241,6 +5290,7 @@ public:
     bool cleanLhs() const override { return false; }  // Eliminated before matters
     bool sizeMattersLhs() const override { return false; }  // Eliminated before matters
     int instrCount() const override { return INSTR_COUNT_DBL; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstRealToBits final : public AstNodeUniop {
 public:
@@ -5256,6 +5306,7 @@ public:
     bool cleanLhs() const override { return false; }  // Eliminated before matters
     bool sizeMattersLhs() const override { return false; }  // Eliminated before matters
     int instrCount() const override { return INSTR_COUNT_DBL; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstRedAnd final : public AstNodeUniop {
 public:
@@ -5337,6 +5388,7 @@ public:
     bool cleanLhs() const override { return false; }  // Eliminated before matters
     bool sizeMattersLhs() const override { return true; }  // Eliminated before matters
     int instrCount() const override { return 0; }
+    bool isSystemFunc() const override { return true; }
 };
 class AstTimeImport final : public AstNodeUniop {
     // Take a constant that represents a time and needs conversion based on time units
@@ -5419,6 +5471,7 @@ public:
     bool cleanLhs() const override { return false; }  // Eliminated before matters
     bool sizeMattersLhs() const override { return true; }  // Eliminated before matters
     int instrCount() const override { return 0; }
+    bool isSystemFunc() const override { return true; }
 };
 
 // === AstNodeSystemUniopD ===
diff --git a/src/V3Coverage.cpp b/src/V3Coverage.cpp
index 6a72acd00..809774657 100644
--- a/src/V3Coverage.cpp
+++ b/src/V3Coverage.cpp
@@ -141,7 +141,7 @@ class CoverageVisitor final : public VNVisitor {
     const VNUser2InUse m_inuser2;
     V3UniqueNames m_exprTempNames;  // For generating unique temporary variable names used by
                                     // expression coverage
-    std::unordered_map<VNRef<AstFuncRef>, AstVar*> m_funcTemps;
+    std::unordered_map<VNRef<AstNodeExpr>, AstVar*> m_funcTemps;
 
     // STATE - across all visitors
     int m_nextHandle = 0;
@@ -784,8 +784,9 @@ class CoverageVisitor final : public VNVisitor {
                 comment += (first ? "" : " && ") + term.m_emitV
                            + "==" + (term.m_objective ? "1" : "0");
                 AstNodeExpr* covExprp = nullptr;
-                if (AstFuncRef* const frefp = VN_CAST(term.m_exprp, FuncRef)) {
-                    AstNodeDType* const dtypep = frefp->taskp()->fvarp()->dtypep();
+                if (VN_IS(term.m_exprp, FuncRef) || term.m_exprp->isSystemFunc()) {
+                    AstNodeExpr* const frefp = term.m_exprp;
+                    AstNodeDType* const dtypep = frefp->dtypep();
                     const auto pair = m_funcTemps.emplace(*frefp, nullptr);
                     AstVar* varp = pair.first->second;
                     if (pair.second) {
diff --git a/test_regress/t/t_sys_file_basic_cover_expr.out b/test_regress/t/t_sys_file_basic_cover_expr.out
new file mode 120000
index 000000000..36fc2f5aa
--- /dev/null
+++ b/test_regress/t/t_sys_file_basic_cover_expr.out
@@ -0,0 +1 @@
+t_sys_file_basic.out
\ No newline at end of file
diff --git a/test_regress/t/t_sys_file_basic_cover_expr.py b/test_regress/t/t_sys_file_basic_cover_expr.py
new file mode 100755
index 000000000..0c86310dc
--- /dev/null
+++ b/test_regress/t/t_sys_file_basic_cover_expr.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2024 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+import vltest_bootstrap
+
+test.scenarios("simulator")
+test.top_filename = "t/t_sys_file_basic.v"
+
+test.unlink_ok(test.obj_dir + "/t_sys_file_basic_test.log")
+
+test.compile(
+    verilator_flags2=["--coverage-expr"],
+    # Build without cached objects, see bug363
+    make_flags=["VM_PARALLEL_BUILDS=0"],
+)
+
+test.execute()
+test.files_identical(test.obj_dir + "/t_sys_file_basic_test.log", test.golden_filename)
+
+test.passes()