diff --git a/src/V3AstNodes.h b/src/V3AstNodes.h
index bc600a599..74fe85b6e 100644
--- a/src/V3AstNodes.h
+++ b/src/V3AstNodes.h
@@ -1405,7 +1405,7 @@ public:
     virtual string name()	const { return m_name; }		// * = Scope name
     virtual void name(const string& name) { m_name = name; }
     string nameDotless() const;
-    string nameVlSym() const { return (((string)"vlSymsp->") + nameDotless()); }
+    string nameVlSym() const { return ((string("vlSymsp->")) + nameDotless()); }
     AstNodeModule* modp()		const { return m_modp; }
     void addVarp(AstNode* nodep) { addOp1p(nodep); }
     AstNode* varsp()		const { return op1p(); }	// op1 = AstVarScope's
@@ -2585,8 +2585,8 @@ public:
     ASTNODE_NODE_FUNCS(Display)
     virtual void dump(std::ostream& str);
     virtual const char* broken() const { BROKEN_RTN(!fmtp()); return NULL; }
-    virtual string verilogKwd() const { return (filep() ? (string)"$f"+(string)displayType().ascii()
-						: (string)"$"+(string)displayType().ascii()); }
+    virtual string verilogKwd() const { return (filep() ? string("$f")+string(displayType().ascii())
+                                                : string("$")+string(displayType().ascii())); }
     virtual bool isGateOptimizable() const { return false; }
     virtual bool isPredictOptimizable() const { return false; }
     virtual bool isPure() const { return false; }	// SPECIAL: $display has 'visual' ordering
diff --git a/src/V3Begin.cpp b/src/V3Begin.cpp
index ba169d570..139040816 100644
--- a/src/V3Begin.cpp
+++ b/src/V3Begin.cpp
@@ -197,7 +197,7 @@ private:
 	    // To keep correct visual order, must add before other Text's
 	    AstNode* afterp = nodep->scopeAttrp();
 	    if (afterp) afterp->unlinkFrBackWithNext();
-	    nodep->scopeAttrp(new AstText(nodep->fileline(), (string)"__DOT__"+m_namedScope));
+            nodep->scopeAttrp(new AstText(nodep->fileline(), string("__DOT__")+m_namedScope));
 	    if (afterp) nodep->scopeAttrp(afterp);
 	}
         iterateChildren(nodep);
diff --git a/src/V3Clock.cpp b/src/V3Clock.cpp
index 7ace2db48..870bc60fc 100644
--- a/src/V3Clock.cpp
+++ b/src/V3Clock.cpp
@@ -75,7 +75,7 @@ private:
 	if (vscp->user1p()) return ((AstVarScope*)vscp->user1p());
 	AstVar* varp = vscp->varp();
 	if (!varp->width1()) varp->v3error("Unsupported: Clock edge on non-single bit signal: "<<varp->prettyName());
-	string newvarname = ((string)"__Vclklast__"+vscp->scopep()->nameDotless()+"__"+varp->name());
+        string newvarname = (string("__Vclklast__")+vscp->scopep()->nameDotless()+"__"+varp->name());
         AstVar* newvarp = new AstVar(vscp->fileline(), AstVarType::MODULETEMP, newvarname, VFlagLogicPacked(), 1);
         newvarp->noReset(true);  // Reset by below assign
 	m_modp->addStmtp(newvarp);
diff --git a/src/V3Const.cpp b/src/V3Const.cpp
index 6caccf26d..a18f1eb94 100644
--- a/src/V3Const.cpp
+++ b/src/V3Const.cpp
@@ -1075,8 +1075,8 @@ private:
 		if (!m_modp) nodep->v3fatalSrc("Not under module");
 		// We could create just one temp variable, but we'll get better optimization
 		// if we make one per term.
-		string name1 = ((string)"__Vconcswap"+cvtToStr(m_modp->varNumGetInc()));
-		string name2 = ((string)"__Vconcswap"+cvtToStr(m_modp->varNumGetInc()));
+                string name1 = (string("__Vconcswap")+cvtToStr(m_modp->varNumGetInc()));
+                string name2 = (string("__Vconcswap")+cvtToStr(m_modp->varNumGetInc()));
 		AstVar* temp1p = new AstVar(sel1p->fileline(), AstVarType::BLOCKTEMP, name1,
 					    VFlagLogicPacked(), msb1-lsb1+1);
 		AstVar* temp2p = new AstVar(sel2p->fileline(), AstVarType::BLOCKTEMP, name2,
diff --git a/src/V3Coverage.cpp b/src/V3Coverage.cpp
index 8f5275b9f..7e27a1197 100644
--- a/src/V3Coverage.cpp
+++ b/src/V3Coverage.cpp
@@ -162,7 +162,7 @@ private:
 		//	We'll do this, and make the if(...) coverinc later.
 
 		// Add signal to hold the old value
-		string newvarname = (string)"__Vtogcov__"+nodep->shortName();
+                string newvarname = string("__Vtogcov__")+nodep->shortName();
                 AstVar* chgVarp = new AstVar(nodep->fileline(), AstVarType::MODULETEMP, newvarname, nodep);
 		chgVarp->fileline()->modifyWarnOff(V3ErrorCode::UNUSED, true);
 		m_modp->addStmtp(chgVarp);
diff --git a/src/V3Depth.cpp b/src/V3Depth.cpp
index 0f54046c3..b590dfcc1 100644
--- a/src/V3Depth.cpp
+++ b/src/V3Depth.cpp
@@ -58,7 +58,7 @@ private:
 	UINFO(6,"  Deep  "<<nodep<<endl);
 	//if (debug()>=9) nodep->dumpTree(cout,"deep:");
 
-	string newvarname = ((string)"__Vdeeptemp"+cvtToStr(m_modp->varNumGetInc()));
+        string newvarname = (string("__Vdeeptemp")+cvtToStr(m_modp->varNumGetInc()));
         AstVar* varp = new AstVar(nodep->fileline(), AstVarType::STMTTEMP, newvarname,
                                   // Width, not widthMin, as we may be in middle of BITSEL expression which
                                   // though it's one bit wide, needs the mask in the upper bits.
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index d95aded86..3d86a49dd 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -233,7 +233,7 @@ public:
 	nodep->v3fatalSrc("Case statements should have been reduced out");
     }
     virtual void visit(AstComment* nodep) {
-	putsDecoration((string)"// "+nodep->name()+" at "+nodep->fileline()->ascii()+"\n");
+        putsDecoration(string("// ")+nodep->name()+" at "+nodep->fileline()->ascii()+"\n");
         iterateChildren(nodep);
     }
     virtual void visit(AstCoverDecl* nodep) {
@@ -776,7 +776,7 @@ public:
     virtual void visit(AstCFile*) {}		// Handled outside the Visit class
     // Default
     virtual void visit(AstNode* nodep) {
-	puts((string)"\n???? // "+nodep->prettyTypeName()+"\n");
+        puts(string("\n???? // ")+nodep->prettyTypeName()+"\n");
         iterateChildren(nodep);
 	nodep->v3fatalSrc("Unknown node type reached emitter: "<<nodep->prettyTypeName());
     }
diff --git a/src/V3EmitCSyms.cpp b/src/V3EmitCSyms.cpp
index f4630ac9d..8bbea2670 100644
--- a/src/V3EmitCSyms.cpp
+++ b/src/V3EmitCSyms.cpp
@@ -299,7 +299,7 @@ void EmitCSyms::emitSymHdr() {
     }
 
     puts("\n// SYMS CLASS\n");
-    puts((string)"class "+symClassName()+" : public VerilatedSyms {\n");
+    puts(string("class ")+symClassName()+" : public VerilatedSyms {\n");
     ofp()->putsPrivate(false);  // public:
 
     puts("\n// LOCAL STATE\n");
@@ -340,7 +340,7 @@ void EmitCSyms::emitSymHdr() {
 
     puts("\n// CREATORS\n");
     puts(symClassName()+"("+topClassName()+"* topp, const char* namep);\n");
-    puts((string)"~"+symClassName()+"() {}\n");
+    puts(string("~")+symClassName()+"() {}\n");
 
     puts("\n// METHODS\n");
     puts("inline const char* name() { return __Vm_namep; }\n");
diff --git a/src/V3EmitV.cpp b/src/V3EmitV.cpp
index ffb7a422e..1d25a5dee 100644
--- a/src/V3EmitV.cpp
+++ b/src/V3EmitV.cpp
@@ -194,7 +194,7 @@ class EmitVBaseVisitor : public EmitCBaseVisitor {
 	putqs(nodep,"end\n");
     }
     virtual void visit(AstComment* nodep) {
-	puts((string)"// "+nodep->name()+"\n");
+        puts(string("// ")+nodep->name()+"\n");
         iterateChildren(nodep);
     }
     virtual void visit(AstContinue* nodep) {
@@ -595,7 +595,7 @@ class EmitVBaseVisitor : public EmitCBaseVisitor {
     virtual void visit(AstCell*) {}		// Handled outside the Visit class
     // Default
     virtual void visit(AstNode* nodep) {
-	puts((string)"\n???? // "+nodep->prettyTypeName()+"\n");
+        puts(string("\n???? // ")+nodep->prettyTypeName()+"\n");
         iterateChildren(nodep);
 	// Not v3fatalSrc so we keep processing
 	nodep->v3error("Internal: Unknown node type reached emitter: "<<nodep->prettyTypeName());
diff --git a/src/V3Error.cpp b/src/V3Error.cpp
index db3575113..a56d76db0 100644
--- a/src/V3Error.cpp
+++ b/src/V3Error.cpp
@@ -130,8 +130,8 @@ string V3Error::msgPrefix() {
     else if (code==V3ErrorCode::EC_FATAL) return "%Error: ";
     else if (code==V3ErrorCode::EC_FATALSRC) return "%Error: Internal Error: ";
     else if (code==V3ErrorCode::EC_ERROR) return "%Error: ";
-    else if (isError(code, supp)) return "%Error-"+(string)code.ascii()+": ";
-    else return "%Warning-"+(string)code.ascii()+": ";
+    else if (isError(code, supp)) return "%Error-"+string(code.ascii())+": ";
+    else return "%Warning-"+string(code.ascii())+": ";
 }
 
 //======================================================================
diff --git a/src/V3FileLine.cpp b/src/V3FileLine.cpp
index 5f608459b..38cc42689 100644
--- a/src/V3FileLine.cpp
+++ b/src/V3FileLine.cpp
@@ -99,7 +99,7 @@ FileLine::FileLine(FileLine::EmptySecret) {
 string FileLine::lineDirectiveStrg(int enterExit) const {
     char numbuf[20]; sprintf(numbuf, "%d", lineno());
     char levelbuf[20]; sprintf(levelbuf, "%d", enterExit);
-    return ((string)"`line "+numbuf+" \""+filename()+"\" "+levelbuf+"\n");
+    return (string("`line ")+numbuf+" \""+filename()+"\" "+levelbuf+"\n");
 }
 
 void FileLine::lineDirective(const char* textp, int& enterExitRef) {
diff --git a/src/V3Inline.cpp b/src/V3Inline.cpp
index c722f3370..32fb3ff10 100644
--- a/src/V3Inline.cpp
+++ b/src/V3Inline.cpp
@@ -438,11 +438,11 @@ private:
 	// To keep correct visual order, must add before other Text's
 	AstNode* afterp = nodep->scopeAttrp();
 	if (afterp) afterp->unlinkFrBackWithNext();
-	nodep->scopeAttrp(new AstText(nodep->fileline(), (string)"__DOT__"+m_cellp->name()));
+        nodep->scopeAttrp(new AstText(nodep->fileline(), string("__DOT__")+m_cellp->name()));
 	if (afterp) nodep->scopeAttrp(afterp);
 	afterp = nodep->scopeEntrp();
 	if (afterp) afterp->unlinkFrBackWithNext();
-	nodep->scopeEntrp(new AstText(nodep->fileline(), (string)"__DOT__"+m_cellp->name()));
+        nodep->scopeEntrp(new AstText(nodep->fileline(), string("__DOT__")+m_cellp->name()));
 	if (afterp) nodep->scopeEntrp(afterp);
         iterateChildren(nodep);
     }
diff --git a/src/V3Inst.cpp b/src/V3Inst.cpp
index 517b5018b..6f1e3e463 100644
--- a/src/V3Inst.cpp
+++ b/src/V3Inst.cpp
@@ -513,7 +513,7 @@ public:
 	    // Make a new temp wire
 	    //if (1||debug()>=9) { pinp->dumpTree(cout,"-in_pin:"); }
 	    AstNode* pinexprp = pinp->exprp()->unlinkFrBack();
-	    string newvarname = ((string)(pinVarp->isOutput() ? "__Vcellout" : "__Vcellinp")
+            string newvarname = (string(pinVarp->isOutput() ? "__Vcellout" : "__Vcellinp")
 				 +(forTristate?"t":"")  // Prevent name conflict if both tri & non-tri add signals
 				 +"__"+cellp->name()+"__"+pinp->name());
             AstVar* newvarp = new AstVar(pinVarp->fileline(), AstVarType::MODULETEMP, newvarname, pinVarp);
diff --git a/src/V3LinkLevel.cpp b/src/V3LinkLevel.cpp
index 4d7e5070e..bd859cf25 100644
--- a/src/V3LinkLevel.cpp
+++ b/src/V3LinkLevel.cpp
@@ -91,7 +91,7 @@ void V3LinkLevel::wrapTop(AstNetlist* netlistp) {
     // We do ONLY the top module
     AstNodeModule* oldmodp = netlistp->modulesp();
     if (!oldmodp) netlistp->v3fatalSrc("No module found to process");
-    AstNodeModule* newmodp = new AstModule(oldmodp->fileline(), (string)"TOP_"+oldmodp->name());
+    AstNodeModule* newmodp = new AstModule(oldmodp->fileline(), string("TOP_")+oldmodp->name());
     // Make the new module first in the list
     oldmodp->unlinkFrBackWithNext();
     newmodp->addNext(oldmodp);
diff --git a/src/V3Name.cpp b/src/V3Name.cpp
index 5a8dafa7a..fbfe6ede8 100644
--- a/src/V3Name.cpp
+++ b/src/V3Name.cpp
@@ -57,13 +57,13 @@ private:
     void rename(AstNode* nodep, bool addPvt) {
 	if (!nodep->user1()) {  // Not already done
 	    if (addPvt) {
-		string newname = (string)"__PVT__"+nodep->name();
+                string newname = string("__PVT__")+nodep->name();
 		nodep->name(newname);
 	    } else {
 		string rsvd = m_words.isKeyword(nodep->name());
 		if (rsvd != "") {
 		    nodep->v3warn(SYMRSVDWORD,"Symbol matches "+rsvd+": '"<<nodep->prettyName()<<"'");
-		    string newname = (string)"__SYM__"+nodep->name();
+                    string newname = string("__SYM__")+nodep->name();
 		    nodep->name(newname);
 		}
 	    }
diff --git a/src/V3Param.cpp b/src/V3Param.cpp
index e9a2ec6aa..d258c193f 100644
--- a/src/V3Param.cpp
+++ b/src/V3Param.cpp
@@ -165,7 +165,7 @@ private:
 	    int num = bucket + offset * BUCKETS;
 	    m_valueMap.insert(make_pair(nodep, num));
 	    // 'z' just to make sure we don't collide with a normal non-hashed number
-	    return (string)"z"+cvtToStr(num);
+            return string("z")+cvtToStr(num);
 	}
     }
     void collectPins(CloneMap* clonemapp, AstNodeModule* modp) {
diff --git a/src/V3ParseImp.cpp b/src/V3ParseImp.cpp
index 6283a9193..1a0d4405a 100644
--- a/src/V3ParseImp.cpp
+++ b/src/V3ParseImp.cpp
@@ -106,7 +106,7 @@ void V3ParseImp::parseFile(FileLine* fileline, const string& modfilename, bool i
 	// intervening +<lang>ext+ options since it was first ecountered.
         FileLine *modfileline = new FileLine(modfilename, 0);
 	modfileline->language(v3Global.opt.fileLanguage(modfilename));
-	ppPushText((string)"`begin_keywords \""+modfileline->language().ascii()+"\"\n");
+        ppPushText(string("`begin_keywords \"")+modfileline->language().ascii()+"\"\n");
     }
 
     // Preprocess into m_ppBuffer
diff --git a/src/V3PreProc.cpp b/src/V3PreProc.cpp
index 4deacc203..b39c27c18 100644
--- a/src/V3PreProc.cpp
+++ b/src/V3PreProc.cpp
@@ -999,7 +999,7 @@ int V3PreProcImp::getStateToken() {
 		break;
 	    }
 	    else {
-		error((string)"Expecting define name. Found: "+tokenName(tok)+"\n");
+                error(string("Expecting define name. Found: ")+tokenName(tok)+"\n");
 		goto next_tok;
 	    }
 	}
@@ -1015,7 +1015,7 @@ int V3PreProcImp::getStateToken() {
 		if (!m_off) return tok;
 		else goto next_tok;
 	    } else {
-		error((string)"Expecting define formal arguments. Found: "+tokenName(tok)+"\n");
+                error(string("Expecting define formal arguments. Found: ")+tokenName(tok)+"\n");
 		goto next_tok;
 	    }
 	}
@@ -1068,7 +1068,7 @@ int V3PreProcImp::getStateToken() {
 	    } else {
 		if (m_defRefs.empty()) fatalSrc("Shouldn't be in DEFPAREN w/o active defref");
 		V3DefineRef* refp = &(m_defRefs.top());
-		error((string)"Expecting ( to begin argument list for define reference `"+refp->name()+"\n");
+                error(string("Expecting ( to begin argument list for define reference `")+refp->name()+"\n");
 		statePop();
 		goto next_tok;
 	    }
@@ -1132,7 +1132,7 @@ int V3PreProcImp::getStateToken() {
                 statePush(ps_STRIFY);
                 goto next_tok;
 	    } else {
-		error((string)"Expecting ) or , to end argument list for define reference. Found: "+tokenName(tok));
+                error(string("Expecting ) or , to end argument list for define reference. Found: ")+tokenName(tok));
 		statePop();
 		goto next_tok;
 	    }
@@ -1161,7 +1161,7 @@ int V3PreProcImp::getStateToken() {
 	    }
 	    else {
 		statePop();
-		error((string)"Expecting include filename. Found: "+tokenName(tok)+"\n");
+                error(string("Expecting include filename. Found: ")+tokenName(tok)+"\n");
 		goto next_tok;
 	    }
 	}
@@ -1175,7 +1175,7 @@ int V3PreProcImp::getStateToken() {
 		goto next_tok;
 	    }
 	    else {
-		error((string)"Expecting `error string. Found: "+tokenName(tok)+"\n");
+                error(string("Expecting `error string. Found: ")+tokenName(tok)+"\n");
 		statePop();
 		goto next_tok;
 	    }
@@ -1217,7 +1217,7 @@ int V3PreProcImp::getStateToken() {
 		while ((pos=out.find("\n")) != string::npos) {
 		    out.replace(pos, 1, " ");
 		}
-		unputString((string)"\""+out+"\"");
+                unputString(string("\"")+out+"\"");
 		statePop();
 		goto next_tok;
 	    }
@@ -1386,7 +1386,7 @@ int V3PreProcImp::getStateToken() {
 	case VP_DEFFORM:	// Handled by state=ps_DEFFORM;
 	case VP_DEFVALUE:	// Handled by state=ps_DEFVALUE;
 	default:
-	    fatalSrc((string)"Internal error: Unexpected token "+tokenName(tok)+"\n");
+            fatalSrc(string("Internal error: Unexpected token ")+tokenName(tok)+"\n");
 	    break;
 	}
 	return tok;
diff --git a/src/V3Premit.cpp b/src/V3Premit.cpp
index f2ef3199b..7b2ab8b93 100644
--- a/src/V3Premit.cpp
+++ b/src/V3Premit.cpp
@@ -151,7 +151,7 @@ private:
     }
 
     AstVar* getBlockTemp(AstNode* nodep) {
-	string newvarname = ((string)"__Vtemp"+cvtToStr(m_modp->varNumGetInc()));
+        string newvarname = (string("__Vtemp")+cvtToStr(m_modp->varNumGetInc()));
         AstVar* varp = new AstVar(nodep->fileline(), AstVarType::STMTTEMP, newvarname,
                                   nodep->dtypep());
 	m_funcp->addInitsp(varp);
diff --git a/src/V3Scope.cpp b/src/V3Scope.cpp
index 79667dd75..61b9d2998 100644
--- a/src/V3Scope.cpp
+++ b/src/V3Scope.cpp
@@ -268,7 +268,7 @@ private:
    }
     virtual void visit(AstScopeName* nodep) {
 	// If there's a %m in the display text, we add a special node that will contain the name()
-	string prefix = (string)("__DOT__")+m_scopep->name();
+        string prefix = string("__DOT__")+m_scopep->name();
 	// TOP and above will be the user's name().
 	// Note 'TOP.' is stripped by scopePrettyName
 	// To keep correct visual order, must add before other Text's
diff --git a/src/V3Split.cpp b/src/V3Split.cpp
index d56135c3e..4ff81a567 100644
--- a/src/V3Split.cpp
+++ b/src/V3Split.cpp
@@ -152,7 +152,7 @@ public:
     SplitVarPostVertex(V3Graph* graphp, AstNode* nodep)
 	: SplitNodeVertex(graphp,nodep) {}
     virtual ~SplitVarPostVertex() {}
-    virtual string name() const { return (string)"POST "+SplitNodeVertex::name(); }
+    virtual string name() const { return string("POST ")+SplitNodeVertex::name(); }
     virtual string dotColor() const { return "CadetBlue"; }
 };
 
@@ -526,10 +526,10 @@ protected:
 	// And a real ordering to get the statements into something reasonable
 	// We don't care if there's cutable violations here...
 	// Non-cutable violations should be impossible; as those edges are program-order
-	if (debug()>=9) m_graph.dumpDotFilePrefixed((string)"splitg_preo", false);
+        if (debug()>=9) m_graph.dumpDotFilePrefixed(string("splitg_preo"), false);
 	m_graph.acyclic(&SplitEdge::followCyclic);
 	m_graph.rank(&SplitEdge::followCyclic);  // Or order(), but that's more expensive
-	if (debug()>=9) m_graph.dumpDotFilePrefixed((string)"splitg_opt", false);
+        if (debug()>=9) m_graph.dumpDotFilePrefixed(string("splitg_opt"), false);
     }
 
     void reorderBlock(AstNode* nodep) {
diff --git a/src/V3Task.cpp b/src/V3Task.cpp
index 2959b1c69..573a51186 100644
--- a/src/V3Task.cpp
+++ b/src/V3Task.cpp
@@ -359,7 +359,7 @@ private:
 	// outvscp is the variable for functions only, if NULL, it's a task
 	if (!refp->taskp()) refp->v3fatalSrc("Unlinked?");
         AstNode* newbodysp = AstNode::cloneTreeNull(refp->taskp()->stmtsp(), true);  // Maybe NULL
-	AstNode* beginp = new AstComment(refp->fileline(), (string)("Function: ")+refp->name());
+        AstNode* beginp = new AstComment(refp->fileline(), string("Function: ")+refp->name());
 	if (newbodysp) beginp->addNext(newbodysp);
 	if (debug()>=9) { beginp->dumpTreeAndNext(cout,"-newbegi:"); }
 	//
@@ -470,7 +470,7 @@ private:
 	AstCFunc* cfuncp = m_statep->ftaskCFuncp(refp->taskp());
 	if (!cfuncp) refp->v3fatalSrc("No non-inline task associated with this task call?");
 	//
-	AstNode* beginp = new AstComment(refp->fileline(), (string)("Function: ")+refp->name());
+        AstNode* beginp = new AstComment(refp->fileline(), string("Function: ")+refp->name());
 	AstCCall* ccallp = new AstCCall(refp->fileline(), cfuncp, NULL);
 	beginp->addNext(ccallp);
 	// Convert complicated outputs to temp signals
diff --git a/src/V3Trace.cpp b/src/V3Trace.cpp
index 2b0c6adb3..2dc054c36 100644
--- a/src/V3Trace.cpp
+++ b/src/V3Trace.cpp
@@ -93,7 +93,7 @@ public:
     }
     virtual string name() const {
 	if (activityAlways()) return "*ALWAYS*";
-	else return ((string)(slow()?"*SLOW* ":""))+insertp()->name();
+        else return (string(slow()?"*SLOW* ":""))+insertp()->name();
     }
     virtual string dotColor() const { return slow()?"yellowGreen":"green"; }
     bool activityCodeValid() const { return m_activityCodeValid; }
diff --git a/src/V3Unknown.cpp b/src/V3Unknown.cpp
index 4387eba3f..50595587a 100644
--- a/src/V3Unknown.cpp
+++ b/src/V3Unknown.cpp
@@ -119,7 +119,7 @@ private:
 	    replaceHandle.relink(newp);
 	}
 	else {
-	    string name = ((string)"__Vlvbound"+cvtToStr(m_modp->varNumGetInc()));
+            string name = (string("__Vlvbound")+cvtToStr(m_modp->varNumGetInc()));
 	    AstVar* varp = new AstVar(fl, AstVarType::MODULETEMP, name,
 				      prep->dtypep());
 	    m_modp->addStmtp(varp);
@@ -287,7 +287,7 @@ private:
 		// Make a Vxrand variable
 		// We use the special XTEMP type so it doesn't break pure functions
 		if (!m_modp) nodep->v3fatalSrc("X number not under module");
-		string newvarname = ((string)"__Vxrand"
+                string newvarname = (string("__Vxrand")
 				     +cvtToStr(m_modp->varNumGetInc()));
 		AstVar* newvarp
                     = new AstVar(nodep->fileline(), AstVarType::XTEMP, newvarname,
diff --git a/src/verilog.y b/src/verilog.y
index 36c67e273..207e96474 100644
--- a/src/verilog.y
+++ b/src/verilog.y
@@ -201,7 +201,7 @@ int V3ParseGrammar::s_modTypeImpNum = 0;
 
 static void ERRSVKWD(FileLine* fileline, const string& tokname) {
     static int toldonce = 0;
-    fileline->v3error((string)"Unexpected \""+tokname+"\": \""+tokname+"\" is a SystemVerilog keyword misused as an identifier.");
+    fileline->v3error(string("Unexpected \"")+tokname+"\": \""+tokname+"\" is a SystemVerilog keyword misused as an identifier.");
     if (!toldonce++) fileline->v3error("Modify the Verilog-2001 code to avoid SV keywords, or use `begin_keywords or --language.");
 }