diff --git a/include/link/object.hpp b/include/link/object.hpp
index 67067b08..7163174f 100644
--- a/include/link/object.hpp
+++ b/include/link/object.hpp
@@ -10,11 +10,6 @@
  */
 void obj_ReadFile(char const *fileName, unsigned int i);
 
-/*
- * Evaluate all assertions
- */
-void obj_CheckAssertions();
-
 /*
  * Sets up object file reading
  * @param nbFiles The number of object files that will be read
diff --git a/include/link/patch.hpp b/include/link/patch.hpp
index cf76fbb9..7e2a68c4 100644
--- a/include/link/patch.hpp
+++ b/include/link/patch.hpp
@@ -3,26 +3,11 @@
 #ifndef RGBDS_LINK_PATCH_H
 #define RGBDS_LINK_PATCH_H
 
-#include <deque>
-#include <stdint.h>
-#include <vector>
-
-#include "linkdefs.hpp"
-
-#include "link/section.hpp"
-
-struct Assertion {
-	Patch patch; // Also used for its `.type`
-	std::string message;
-	// This would be redundant with `.section->fileSymbols`, but `section` is sometimes `nullptr`!
-	std::vector<Symbol> *fileSymbols;
-};
-
 /*
  * Checks all assertions
  * @return true if assertion failed
  */
-void patch_CheckAssertions(std::deque<Assertion> &assertions);
+void patch_CheckAssertions();
 
 /*
  * Applies all SECTIONs' patches to them
diff --git a/include/link/section.hpp b/include/link/section.hpp
index 64bae79e..191f4493 100644
--- a/include/link/section.hpp
+++ b/include/link/section.hpp
@@ -5,6 +5,7 @@
 
 // GUIDELINE: external code MUST NOT BE AWARE of the data structure used!
 
+#include <deque>
 #include <memory>
 #include <stdint.h>
 #include <string>
@@ -13,6 +14,7 @@
 #include "linkdefs.hpp"
 
 #include "link/main.hpp"
+#include "link/patch.hpp"
 
 struct FileStackNode;
 struct Section;
@@ -53,6 +55,15 @@ struct Section {
 	std::unique_ptr<Section> nextu; // The next "component" of this unionized sect
 };
 
+struct Assertion {
+	Patch patch; // Also used for its `.type`
+	std::string message;
+	// This would be redundant with `.section->fileSymbols`, but `section` is sometimes `nullptr`!
+	std::vector<Symbol> *fileSymbols;
+};
+
+extern std::deque<Assertion> assertions;
+
 /*
  * Execute a callback for each section currently registered.
  * This is to avoid exposing the data structure in which sections are stored.
diff --git a/src/link/main.cpp b/src/link/main.cpp
index 8d7366f9..d0cb440c 100644
--- a/src/link/main.cpp
+++ b/src/link/main.cpp
@@ -457,7 +457,7 @@ int main(int argc, char *argv[]) {
 	if (nbErrors != 0)
 		reportErrors();
 	assign_AssignSections();
-	obj_CheckAssertions();
+	patch_CheckAssertions();
 
 	// and finally output the result.
 	patch_ApplyPatches();
diff --git a/src/link/object.cpp b/src/link/object.cpp
index 2d878ecb..cf3c84cb 100644
--- a/src/link/object.cpp
+++ b/src/link/object.cpp
@@ -28,7 +28,6 @@
 
 static std::deque<std::vector<Symbol>> symbolLists;
 static std::vector<std::vector<FileStackNode>> nodes;
-static std::deque<Assertion> assertions;
 
 // Helper functions for reading object files
 
@@ -632,10 +631,6 @@ void obj_ReadFile(char const *fileName, unsigned int fileID) {
 	}
 }
 
-void obj_CheckAssertions() {
-	patch_CheckAssertions(assertions);
-}
-
 void obj_Setup(unsigned int nbFiles) {
 	nodes.resize(nbFiles);
 }
diff --git a/src/link/patch.cpp b/src/link/patch.cpp
index 111802de..a9919817 100644
--- a/src/link/patch.cpp
+++ b/src/link/patch.cpp
@@ -3,20 +3,29 @@
 #include "link/patch.hpp"
 
 #include <assert.h>
+#include <deque>
 #include <inttypes.h>
 #include <limits.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <variant>
+#include <vector>
 
 #include "error.hpp"
 #include "helpers.hpp"
 #include "opmath.hpp"
 #include "platform.hpp"
 
+#include "linkdefs.hpp"
+
+#include "link/main.hpp"
 #include "link/object.hpp"
+#include "link/section.hpp"
 #include "link/symbol.hpp"
 
+std::deque<Assertion> assertions;
+
 struct RPNStackEntry {
 	int32_t value;
 	bool errorFlag; // Whether the value is a placeholder inserted for error recovery
@@ -88,10 +97,6 @@ static int32_t computeRPNExpr(Patch const &patch, std::vector<Symbol> const &fil
 		// So, if there are two `popRPN` in the same expression, make
 		// sure the operation is commutative.
 		switch (command) {
-			Symbol const *symbol;
-			char const *name;
-			Section const *sect;
-
 		case RPN_ADD:
 			value = popRPN(patch) + popRPN(patch);
 			break;
@@ -207,9 +212,8 @@ static int32_t computeRPNExpr(Patch const &patch, std::vector<Symbol> const &fil
 			value = 0;
 			for (uint8_t shift = 0; shift < 32; shift += 8)
 				value |= getRPNByte(expression, size, patch) << shift;
-			symbol = getSymbol(fileSymbols, value);
 
-			if (!symbol) {
+			if (Symbol const *symbol = getSymbol(fileSymbols, value); !symbol) {
 				error(
 				    patch.src,
 				    patch.lineNo,
@@ -232,16 +236,14 @@ static int32_t computeRPNExpr(Patch const &patch, std::vector<Symbol> const &fil
 			}
 			break;
 
-		case RPN_BANK_SECT:
+		case RPN_BANK_SECT: {
 			// `expression` is not guaranteed to be '\0'-terminated. If it is not,
 			// `getRPNByte` will have a fatal internal error.
-			name = (char const *)expression;
+			char const *name = (char const *)expression;
 			while (getRPNByte(expression, size, patch))
 				;
 
-			sect = sect_GetSection(name);
-
-			if (!sect) {
+			if (Section const *sect = sect_GetSection(name); !sect) {
 				error(
 				    patch.src,
 				    patch.lineNo,
@@ -254,6 +256,7 @@ static int32_t computeRPNExpr(Patch const &patch, std::vector<Symbol> const &fil
 				value = sect->bank;
 			}
 			break;
+		}
 
 		case RPN_BANK_SELF:
 			if (!patch.pcSection) {
@@ -265,15 +268,13 @@ static int32_t computeRPNExpr(Patch const &patch, std::vector<Symbol> const &fil
 			}
 			break;
 
-		case RPN_SIZEOF_SECT:
+		case RPN_SIZEOF_SECT: {
 			// This has assumptions commented in the `RPN_BANK_SECT` case above.
-			name = (char const *)expression;
+			char const *name = (char const *)expression;
 			while (getRPNByte(expression, size, patch))
 				;
 
-			sect = sect_GetSection(name);
-
-			if (!sect) {
+			if (Section const *sect = sect_GetSection(name); !sect) {
 				error(
 				    patch.src,
 				    patch.lineNo,
@@ -286,17 +287,15 @@ static int32_t computeRPNExpr(Patch const &patch, std::vector<Symbol> const &fil
 				value = sect->size;
 			}
 			break;
+		}
 
-		case RPN_STARTOF_SECT:
+		case RPN_STARTOF_SECT: {
 			// This has assumptions commented in the `RPN_BANK_SECT` case above.
-			name = (char const *)expression;
+			char const *name = (char const *)expression;
 			while (getRPNByte(expression, size, patch))
 				;
 
-			sect = sect_GetSection(name);
-			assert(sect->offset == 0);
-
-			if (!sect) {
+			if (Section const *sect = sect_GetSection(name); !sect) {
 				error(
 				    patch.src,
 				    patch.lineNo,
@@ -306,9 +305,11 @@ static int32_t computeRPNExpr(Patch const &patch, std::vector<Symbol> const &fil
 				isError = true;
 				value = 1;
 			} else {
+				assert(sect->offset == 0);
 				value = sect->org;
 			}
 			break;
+		}
 
 		case RPN_SIZEOF_SECTTYPE:
 			value = getRPNByte(expression, size, patch);
@@ -373,9 +374,7 @@ static int32_t computeRPNExpr(Patch const &patch, std::vector<Symbol> const &fil
 					value = patch.pcOffset + patch.pcSection->org;
 				}
 			} else {
-				symbol = getSymbol(fileSymbols, value);
-
-				if (!symbol) {
+				if (Symbol const *symbol = getSymbol(fileSymbols, value); !symbol) {
 					error(
 					    patch.src,
 					    patch.lineNo,
@@ -403,7 +402,7 @@ static int32_t computeRPNExpr(Patch const &patch, std::vector<Symbol> const &fil
 	return popRPN(patch);
 }
 
-void patch_CheckAssertions(std::deque<Assertion> &assertions) {
+void patch_CheckAssertions() {
 	verbosePrint("Checking assertions...\n");
 
 	for (Assertion &assert : assertions) {
diff --git a/src/link/section.cpp b/src/link/section.cpp
index 0173bd11..7869d8b9 100644
--- a/src/link/section.cpp
+++ b/src/link/section.cpp
@@ -3,7 +3,6 @@
 #include "link/section.hpp"
 
 #include <assert.h>
-#include <deque>
 #include <inttypes.h>
 #include <stdlib.h>
 #include <string.h>