cgen: add asm to c_reserved, fixes compilation of struct Abc { @asm int } (#22340)

vlib/v/gen/c/cgen.v

@@ -20,13 +20,13 @@ import sync.pool
 // in C++, or have special meaning in V, thus need escaping too. `small`
 // should not be needed, but see:
 // https://stackoverflow.com/questions/5874215/what-is-rpcndr-h
-const c_reserved = ['array', 'auto', 'bool', 'break', 'calloc', 'case', 'char', 'class', 'complex',
-	'const', 'continue', 'default', 'delete', 'do', 'double', 'else', 'enum', 'error', 'exit',
-	'export', 'extern', 'false', 'float', 'for', 'free', 'goto', 'if', 'inline', 'int', 'link',
-	'long', 'malloc', 'namespace', 'new', 'nil', 'panic', 'register', 'restrict', 'return', 'short',
-	'signed', 'sizeof', 'static', 'string', 'struct', 'switch', 'typedef', 'typename', 'union',
-	'unix', 'unsigned', 'void', 'volatile', 'while', 'template', 'true', 'small', 'stdout', 'stdin',
-	'stderr', 'far', 'near', 'huge', 'requires']
+const c_reserved = ['asm', 'array', 'auto', 'bool', 'break', 'calloc', 'case', 'char', 'class',
+	'complex', 'const', 'continue', 'default', 'delete', 'do', 'double', 'else', 'enum', 'error',
+	'exit', 'export', 'extern', 'false', 'float', 'for', 'free', 'goto', 'if', 'inline', 'int',
+	'link', 'long', 'malloc', 'namespace', 'new', 'nil', 'panic', 'register', 'restrict', 'return',
+	'short', 'signed', 'sizeof', 'static', 'string', 'struct', 'switch', 'typedef', 'typename',
+	'union', 'unix', 'unsigned', 'void', 'volatile', 'while', 'template', 'true', 'small', 'stdout',
+	'stdin', 'stderr', 'far', 'near', 'huge', 'requires']
 const c_reserved_chk = token.new_keywords_matcher_from_array_trie(c_reserved)
 // same order as in token.Kind
 const cmp_str = ['eq', 'ne', 'gt', 'lt', 'ge', 'le']

vlib/v/tests/reserved_keyword_asm_test.v

@@ -0,0 +1,26 @@
+struct Abc {
+	@asm string
+}
+
+enum Enum {
+	@asm
+	end
+}
+
+fn test_struct() {
+	dump(Abc{})
+	assert true
+}
+
+fn test_local() {
+	@asm := 12
+	dump(@asm)
+	assert true
+}
+
+fn test_enum() {
+	dump(unsafe { Enum(0) })
+	dump(Enum.@asm)
+	dump(Enum.end)
+	assert true
+}